Elementary school equation application problem
1. The planned investment of the school building is 450,000 yuan, and the actual investment is 400,000 yuan. What percentage has the actual investment saved?
2. The school planned to use 480 degrees of electricity in May, but actually used 60 degrees less. What percentage of electricity was actually saved? (Fujian Xiao Yun Experimental Primary School)
A factory planned to produce 400 TV sets in March, but actually produced 250 TV sets in the first half and 230 TV sets in the second half. What is the actual percentage of exceeding the plan? (Nanchang qingyunpu district)
4. At present, there are three water pipes, A, B and C. The water pipe A flows out the salt water with a salt content of 20% at a flow rate of 4g per second, B flows out the salt water with a salt content of 15% at a flow rate of 6g per second, and C flows out at a flow rate of 10g per second. After the pipe C is opened, stop the flow for 2 seconds, then flow for 5 seconds, then stop the flow for 2 seconds, then flow for 5 seconds ...
There are 75 students in the painting and calligraphy class and 48 students in the dance class in Guangxin Primary School. What percentage of painting and calligraphy classes are more than dance classes? (Nanning)
6. Xiaoming experimented with a bag of mung beans, among which there were 100 germinated seeds and 25 non-germinated seeds. Find the germination rate of this bag of mung beans. (Wenling City, Zhejiang Province)
After reading 4 pages, how many parts did you read the next day? (Wuxi City, Jiangsu Province)
8. For the disaster area, Xiaohua donated 4.2 yuan, 0.4 yuan more than Xiaoli. How much did Xiaohua donate more than Xiaoli? (Anyang City, Henan Province)
9. A dress was sold at a 20% discount 100 yuan, which was actually sold in 90 yuan. What is the actual discount? (Xianju County, Zhejiang Province)
10. The canteen sent 600 kg of rice, which has been eaten for 4 days, 50 kg per day. How many Jin do you eat every day for the remaining five days? (Nanjing jianye district)
1 1.3 boxes of oranges are 24 kilograms less than 3 baskets of apples. On average, each box of oranges weighs 20 kilograms, and how many kilograms does each basket of apples weigh? (Taizhou City, Zhejiang Province)
12. In the activity of collecting tree species for greening the motherland, 20 kilograms of tree species were collected by five classes in grade four and 60 kilograms by three classes in grade five in a school. How many kilograms of tree species were collected in each class on average? (Shanghai)
13. Da Qiao Town built a canal with a length of 2 100 meters, which lasted for 5 days, with an average of 240 meters per day. The remaining tasks should be completed within 3 days. How many meters do you need to repair every day on average? (Qinhuai District, Nanjing)
14. Xiaoming went to the store to buy three mini-soccer balls and gave them 20 yuan. He got back 1.85 yuan. How much is each football? (Yinchuan Experimental Primary School)
15. There are 4 teams in one class, and each team has 12 young pioneers. In the donation activity of "Project Hope", * * * donated 240 yuan. How much does each young pioneer donate on average? (Shanghai)
16. Yucai Primary School bought 2 small soccer balls and 25 long ropes, which cost 408.5 yuan. The price of each small football is 48 yuan. What's the price of each long rope? (nanchang district, Wuxi City, Jiangsu Province)
17. Wang Hua bought five copies of Interesting Mathematics and five copies of Story King, and bought one with 20 yuan. How much is each copy of interesting mathematics, 2.6 yuan and Story King? (Yanta District, Xi City)
18. The convoy has to transport 89 tons of goods, and the first three times each transport 10.5 tons. The rest will be shipped in five installments. How many tons per shipment on average? (Shanghai)
19.4 students play singles on the table tennis table for 60 minutes. How many minutes did each student play on average? (Jian 'ou City, Fujian Province)
20. The average score of Chinese, mathematics and common sense in the final exam is 95, and the average score of Chinese and mathematics is 93. Q: How many points did you get in the common sense exam? (Jiangshan City, Zhejiang Province)
Class 2 1.5 (1) planted trees, with 6 trees for 26 boys and 5 trees for 24 girls. How many trees do boys and girls plant on average? (donghu district, Nanchang)
22. Dong Li used 5 yuan money to buy stationery. He has spent 1.5 yuan to buy pencils, and the rest of the money is used to buy exercise books, each of which is 0.35 yuan. How many exercise books can he buy? (Shanghai Changqing School)
23. If a batch of apples are divided equally among the children in the kindergarten class, each person can get 6 apples; If it is divided equally among the children in the kindergarten class, each person can get 3; How much can each child get if it is divided equally between the big class and the small class? (Nanjing jianye district)
24. Shixin Watch Factory originally planned to produce 75 watches every day, and completed the task in 12 days. It takes 10 days to actually complete the task. How many pieces are actually produced every day on average? (Wuhan Qingshan School)
25. The experimental primary school carried out the activity of "planting potted flowers in environmental protection week". Plant 1 14 pots every day for the first three days, and plant 750 pots in the last four days. How many potted flowers are planted every day during "Environmental Protection Week"? (Changsha Experimental Primary School)
The remaining 7.5 hours need to be cultivated. How much farmland is plowed per hour on average? (Yangxin County, Hubei Province)
27. A loom weaves105m in 7 hours. At this speed, how many meters can a loom weave in 8 hours? (Lin 'an City, Zhejiang Province)
28. A car travels for 3 hours 135 km. According to this calculation, how many kilometers do you drive in 8 hours? (Guilin, Guangxi)
29. 120 kg of soybean can squeeze out 16.2 kg of soybean oil, and how many kg of soybean oil can be squeezed out of 2000 kg of soybean? (Using Proportional Solution) (Taishun County, Zhejiang Province)
30. Two mills in a processing plant can grind 14.4 tons of flour in 3 hours. According to this calculation, how many tons of flour can six mills grind in 8 hours? (Jian 'ou City, Fujian Province)
3 1. A garment factory received the task of producing 1200 shirts, and completed 40% in the first three days. According to this calculation, how many days will it take to complete the task? (Write two different solutions) (Shouchun School in Hefei Central District)
32. An engineering team wants to pave an expressway, which has been paved for 2.8 kilometers in the first 20 days. According to this calculation, how many days will it take to pave the remaining 4.2 kilometers? (Solving by Proportional Method) (Linhai City, Zhejiang Province)
33. Harvest Farm Tools Factory produces a batch of sickles. It was originally planned to manufacture 360 pieces every day, which was completed in 18 days. In fact, there are 72 more every day. According to this calculation, how many days will it take to complete the task? (Qingshan District, Wuhan)
Changfeng electric fan factory plans to produce 2800 electric fans. 672 units have been produced in the first six days. According to this calculation, how many days will it take to complete the task? (baixia district, Nanjing)
35. The school-run factory of Yumin Primary School originally planned to bind 2 1600 exercise books every day, but actually 360 more exercise books were bound every day than originally planned. How many days did it take to actually complete the production task? (Hongqiao District, Tianjin)
Xiaoqing reads a 260-page story book. She read 20 pages a day for the first three days. If the rest read 25 pages a day, how many days will it take? (Chengzhong District, Xining City)
37. The school bought 342 meters of plastic rope for short jump rope. First, cut five pieces of the same length, one piece is 9 meters. According to this calculation, how many plastic ropes can be used for short skipping? (Gulou District, Nanjing)
38. The unit price of two baskets of apples is the same. The apples in basket A weigh 64kg, and those in basket B weigh 48kg. After the two baskets are sold out, the remaining apples weigh the same. As we all know, basket B sells fewer apples than basket A, 56 yuan. How much can basket a sell for? (Shouchun School in Hefei Central District)
39. Shixin Watch Factory originally planned to produce 1000 watches in 25 days, but actually produced 50 watches every day. How many days did it actually finish the task ahead of schedule? (Kaifeng City, Henan Province)
40. The TV factory planned to produce 1200 TV sets in 30 days, but in fact, it produced 10 more TV sets every day than planned. How many days did it actually complete the task? (Dongyang City, Zhejiang Province)
4 1. The clothing factory wants to process a batch of school uniforms. It was originally planned to produce 250 sets a day and complete them in 30 days. In fact, it produces 300 sets every day. Actually, it will take a few days to finish. (Answer in proportion) (Jingdezhen City, Jiangxi Province)
42. A batch of goods was originally planned to transport 65,438+08 tons per day, and the transportation was completed in 84 days. Actually, it needs to transport 2 1 ton every day. How many days does it actually take? (Solved in proportion) (Yinchuan No.21 Primary School)
43. The assembly team will assemble a batch of washing machines. It is planned to assemble 27 washing machines every day and complete the task in 20 days. Actually, 30 sets are assembled every day, and it only takes a few days to complete the task. (Beitang District, Wuxi City, Jiangsu Province)
44. The canteen of Daqing Primary School delivers 24 tons of coal, and it is planned to burn for 50 days. Actually saving 0.08 tons per day, how many days did it actually burn? (Yueqing City, Zhejiang Province)
45. The workshop produces a batch of parts, and 65 sets are produced every day. After 12 days of production, there is still a shortage of 130 sets. How many sets of parts are there in this batch? (Landslide Road Primary School, Jianghan District, Wuhan)
46. I hope that primary schools will decorate multimedia classrooms. It is planned to use glazed square bricks with a side length of 30 cm to pave the floor, which needs 900 pieces. How many pieces do you actually need to use square marble with a side length of 50 cm to pave the floor? (Answer with proportional knowledge) (donghu district, Nanchang)
47. To bind a batch of identical exercise books, it was originally planned that each book should have 16 pages, and 250 volumes can be bound. If 200 books are bound, how many pages should each book have? (Proportional solution) (Guilin, Guangxi)
48. The garment factory originally planned to make 120 suits, each with 4.8m cloth. After improving the cutting method, each suit saves 0.3 meters of cloth. How many suits can you make with the saved cloth? (Shanghai Changqing School)
49. The master processes 192 parts more than the apprentice. It is known that the number of parts processed by the master is four times that of the apprentice. How many parts do the master and apprentice process respectively? (Equation Solving) (Yinchuan No.21 Primary School)
50. Hong Guang Farm Tools Factory produced 600 farm tools in May, 25% more than in April. How many farm tools did it produce in April? (Qingshan District, Wuhan)
5 1. Hongxing Textile Factory has 174 female employees, 6-3 times less than the number of male employees. How many employees are there in the whole factory? (Shaoxing County, Zhejiang Province)
Second solution) (Yinchuan experimental primary school)
53. Baylor Primary School has 86 students in the third grade, four fewer than the second grade. How many students are there in Grade Two? (Changsha Experimental Primary School)
54. There are 630 boys in one school, with a ratio of 7: 8. How many girls are there in this school? (Shangcheng District, Hangzhou)
55. Zhang Hua read a story book. On the first day, 15% of the books were missing 4 pages. At this time, the ratio of pages read to remaining pages is 65,438+0: 7. How many pages does this story book have? (Pingyang County, Zhejiang Province)
56. A bookshelf has two layers, and the books on the upper layer are three times as many as those on the lower layer; If you take 30 books from the upper floor and put them on the lower floor, the number of books on the two floors is exactly the same. How many books are there on each shelf? (Hongkou District, Shanghai)
57. There are 89 books on the first floor, which is less than that on the second floor 16. The books on the third shelf are 1.5 times as many as those on the first and second shelves. How many books are there on the third floor? (Nanchang qingyunpu district)
The ratio of the number of art books to the number of other two books is 1: 5, and the reference books and literature books are 180. How many books are there in the bookcase? (Wuxi City, Jiangsu Province)
59. There are two students, A and B. After each student donated 15 yuan to the people in the disaster area, the ratio of the remaining money A to B is 3: 4. B how much money did you save? (Jingdezhen City, Jiangxi Province)
60. Xiaohong and Xiao Fang have saved some pocket money. The ratio of their savings is 5: 3. In the donation activity of "supporting the disaster area", Xiaohong donated 26 yuan and Xiao Fang donated 10 yuan, and the remaining money was equal. How much money does Xiaohong have? (Qingshan District, Wuhan)
6 1. The school bought back 3 15 seedlings, and plans to distribute them to middle and senior grades for planting according to the ratio of 3: 4. How many more trees have been planted in the senior grade than in the middle grade? (Chang 'an District, Shijiazhuang City)
62. A total of 180 plants were planted in the third, fourth and fifth grades, and the planting ratio in the third, fourth and fifth grades was 3: 5: 7. So how many trees are there in three grades? (Changshan County, Zhejiang Province)
63. The school plans to divide the task of planting trees into six grades and other grades according to the ratio of 5: 3. Results The number of trees planted in the sixth grade accounted for 75% of the whole school, 20 more than planned. How many trees does the school plan to plant? (Yanta District, Xi City)
64. A glass of 80 grams of salt water contains 4 grams of salt. Now, how many grams of salt or water should be added to make the ratio of salt to water in this glass of brine become 1∶9? (Deqing County, Zhejiang Province)
65. The fruit shop delivered 540 kilograms of apples and pears, and the weight ratio of apples and pears was 12: 15. How many kilograms of pears were shipped? (baixia district, Nanjing)
66. The fruit shop brought 300 Jin of oranges, grapes are 50 Jin more than oranges, apples are twice as much as grapes, and how many Jin are apples more than oranges? (Hongkou District, Shanghai)
67. Divide 960 kg of feed to two professional chicken farmers, A and B, according to the ratio of 7: 5. How many kilograms of feed do specialized households get more than specialized households? (Qinhuai District, Nanjing)
68. The raw rice stored in warehouse A and warehouse B are equal. At present, there are 0/4 tons of rice out of warehouse A and 26 tons of rice out of warehouse B. At this time, the remaining rice in warehouse A is 40% more than that in warehouse B. So how many tons of rice were originally stored in warehouse A and warehouse B? (Jiaxing City, Zhejiang Province)
The school playground is a rectangle with a circumference of 280 meters. The aspect ratio is 4: 3. What is the length and width of this playground? (Songzi City, Hubei Province)
70. Bibo Kindergarten has a clever and beautiful rectangular flower bed with a circumference of 64 meters and an aspect ratio of 5: 3. How many square meters is this flower bed? (Changsha Experimental Primary School)
7 1. On a large-scale map, the distance between A and B is 5cm. What is the actual distance between a and b? (donghu district, Nanchang)
72. A toy factory produces a batch of children's toys. It was originally planned to produce 120 pieces per day, which will be completed in 75 days. In order to welcome Children's Day on June 1st, it actually took only 60 days to complete the task. How many toys are actually produced every day? (Two ways to answer) (Wenling City, Zhejiang Province)
73. Two furniture factories, A and B, produce single tables and chairs with the same specifications. Because of their characteristics,
Can produce 1500 sets of tables and chairs. Now the two factories are jointly producing, and after reasonable arrangements, they try their best to give full play to their respective specialties. How many more tables and chairs can these two factories produce each month than in the past? (Wuhan Foreign Language School)
74. The construction site needs to transport 122 tons of cement. After being transported by a 4-ton truck 18 times, how many times will the rest be transported by a 2.5-ton truck? (Zhuji City, Zhejiang Province)
75. In April, the air conditioning factory produced1.80000 air conditioners, an increase of 10% in May compared with April. How many air conditioners were produced in April and May? (Beitang District, Wuxi City, Jiangsu Province)
76. Master and apprentice cooperated to produce a batch of parts. The master produces 40 pieces per hour and the apprentice produces 30 pieces per hour. For example, the apprentice completed the task and just produced 450 pieces. How many parts are there in this batch? (Qingshan District, Wuhan)
77. A processes 48 parts per hour and B processes 36 parts per hour. After two people worked together for 8 hours, 64 waste products were detected. How many qualified parts do two people process per hour on average? (Shanghai)
Dude, 540 pieces have been sold. How many parts are there in this batch? (Cixi City, Zhejiang Province)
79. Party A and Party B worked together for 3.5 hours to produce 350 parts, and 80% of the tasks were completed. It is known that A does 42 per hour and B does several per hour. (Ninghai County, Zhejiang Province)
80. Both parties process the same number of parts at the same time. Party A improved the work efficiency every hour, and it took 7.5 hours to complete all the processing tasks. At this point, A still has 20 parts unfinished. Ask B how many parts are processed per hour after improving work efficiency. (jiangdong district, Ningbo, Zhejiang)
8 1. Master and apprentice processed a batch of parts, the apprentice processed 20% of the total, and the master processed the total)
82. A fertilizer plant produced an average of 24,000 tons of fertilizer per month in the first quarter. The total output of chemical fertilizer in the first two months was 8000 tons more than that in March. How many ten thousand tons of chemical fertilizer were produced in March? (Lin 'an City, Zhejiang Province)
Tons. How many tons is this batch of cement? (dangyang city, Hubei)
84. Hongxing Township harvested 3,600 tons of corn this year, an increase of 20% over last year. How many tons of corn did it harvest last year? (Huangpu District, Guangzhou)
85. It costs 249.6 yuan to buy 6 volleyballs and 8 basketballs. The known unit price of volleyball is 15.6 yuan. What is the unit price of basketball? (Yinxian County, Zhejiang Province)
There are as many repairs as there are. How long is this road? (Qingshan District, Wuhan)
87. On the first day, the road team built 55 meters of road. The next day, the road was three times longer than the first day. The third day is 30 meters less than the previous two days combined. How many meters were built on the third day? (Beitang District, Wuxi City, Jiangsu Province)
4700 meters unpaved. What is the total length of this highway? (Yueqing City, Zhejiang Province)
89. The construction team paved the playground, covering 200 square meters in four days. According to this progress, the playground was paved in 32 days and the area of the playground was found. (Two solutions, one of which is proportional solution) (Dongyang City, Zhejiang Province)
90. Shixin Watch Factory originally planned to produce 75 watches every day, and completed the task in 12 days. Actually, 15 pieces were produced more than planned every day. How many days did it actually take to finish this task? (Qingshan District, Wuhan)
9 1. The assembly group will assemble a batch of washing machines. It is planned to assemble 20 washing machines every day, and complete the task in 15 days. In fact, it takes only a few days to assemble 30 units a day to complete the task. (Solving by Proportional Method) (Xi 'an Shizhong District)
92. This machinery factory has produced a batch of parts. It was originally planned to produce 250 pieces per day, which was completed in 12 days. The number of parts actually produced every day is 65,438+0.5 times. How many days did it actually take to complete this batch of parts? (Shanghai Changqing School)
93. The road team built a road. It was originally planned to build 3.2 kilometers a day and finish it in 45 days. In fact, 3.6 kilometers were built in one day. How many days can it be finished? (Guilin, Guangxi)
94. For a project, it takes 12 hours for Team A to do it alone, and 15 hours for Team B to do it alone. Now, how many hours does it take for two teams to work together to complete half of the project? (Huangpu District, Guangzhou)
95. It takes 30 hours for the master to process a batch of parts. If the apprentice processes 9 hours first and the master processes the rest for 24 hours, how many hours will the apprentice process alone? (Jingdezhen City, Jiangxi Province)
You can play 10 for one hour. If Xiao Zhang plays alone, it will be over in a few hours. (dangyang city, Hubei)
97. A batch of goods can be transported by large trucks and small trucks at the same time, and it can be shipped in six hours. If it is transported by large trucks alone, it can be transported in 10 hour. How many hours does it take a person to transport it in a pickup truck? (Changshan County, Zhejiang Province)
A rested for 3 days, B rested for 2 days, and C didn't rest. If A's daily workload is three times that of C, and B's daily workload is twice that of C, when will the work be finished? (Nanchang Foreign Language School)
99. Party A 16 days, and Party B 12 days can complete a project ... Now B does three days, and A does the rest. How many days will it take to complete this project? (Chang 'an District, Shijiazhuang City)
If it takes 24 days for Team B to finish it alone, how many days will it take for Team A to finish it alone? (Qingshan District, Wuhan)
After two days, how many days will the remaining B work? (Yinchuan No.21 Primary School)
102. Team A completed a project in 15 days, and Team B completed a project in 12 days. Now, after four days of cooperation between Party A and Party B, the remaining projects will be completed by Team C within eight days. If the project is done by one person in Group C, how many days will it take to complete? (Deqing County, Zhejiang Province)
How many days can two teams finish now? (Yangxin County, Hubei Province)
If two teams cooperate, how many days can it be completed? (Xiangshan County, Zhejiang Province)
105. The length of a highway1500m. It takes 15 days to repair A alone and 10 days to repair B. How many days does it take for the two teams to repair together? (Jiangshan City, Zhejiang Province)
Jiangdong district)
107.A It takes 8 days to finish a job alone, and B's work efficiency is twice that of A. How many days does it take for two people to finish the job together? (Hongqiao District, Tianjin)
108. The master and the apprentice * * * finished a job together, and the apprentice finished it in 20 days, 4 days more than the master. How many days will it take to cooperate with mentoring? (Yinchuan Experimental Primary School)
1 10. It takes 10 days for Party A to do a job alone, and 15 days for Party B to do a job alone. How many days can Party A and Party B cooperate to complete 80% of the work? (Wenling City, Zhejiang Province)
1 165438+ If it takes 5 minutes, what should be the average speed of Zhang Ming's cycling? (Xianju County, Zhejiang Province)
1 12. Xiaoming walks from home to school for 35 minutes and rides a bike 10 minutes. He walked from home by bike for 8 minutes, and his bike broke down, so he walked instead. How many minutes did Xiao Ming spend from home to school? (Taizhou City, Zhejiang Province)
1 13. It takes Zhang Hua 15 minutes to walk from home to school and 5 minutes to ride a bike. He started from home by bike. Three minutes later, his car broke down and he walked instead. How many minutes did it take him to go to school on foot? (Kaifeng City, Henan Province)
114. the distance between a and b is 240 kilometers. A car travels 80 kilometers from A to B in two hours. According to this calculation, how many hours does the whole journey take? (Chang 'an District, Shijiazhuang)
1 15.A train goes from place a to place b at a speed of 50 kilometers per hour and arrives in 6 hours; When you return, you can go forward at a speed of 60 kilometers per hour. How many hours can you arrive? (Hongkou District, Shanghai)
1 16. The railway from city A to city B is 760 kilometers long, and a train travels 285 kilometers in three hours. According to this calculation, how many hours does it take from city A to city B? (There are two solutions, one of which is proportional) (Shangyu City, Zhejiang Province)
1 17. The scientific research ship plans to travel at a speed of 25 kilometers per hour, and will arrive at the scheduled sea area for scientific experiments after 48 hours. How many kilometers per hour do you need to drive if you want to arrive 8 hours in advance? (Jiaxing City, Zhejiang Province)
1 18. Two trains leave from two places 432 kilometers apart at the same time and meet four hours later. The express train runs 60 kilometers per hour. How many kilometers does the local train travel per hour? (Solving equations) (dangyang city, Hubei)
1 19.A and B started from two places 520 kilometers apart at the same time and met for 5 hours. As we all know, car A travels 6 kilometers more per hour than car B. How many kilometers do A and B run per hour? (Shanghai)
Kilometers, how many kilometers per hour is the B train? (Landslide Road Primary School, Jianghan District, Wuhan)
12 1.A and B trains leave from A and B respectively at the same time. Six hours after the two cars meet, they continue to drive at the original speed. Four hours later, a car arrives at B. It is known that A car travels more than B car per hour 12km. How many kilometers does A car travel per hour? (Gulou District, Nanjing)
122. A freight train leaves from place A to place B at 6 am, with an average speed of 45 kilometers per hour. A passenger train departs from B to A, with an average speed of15km. As we all know, passenger trains leave two hours later than freight trains. At noon 12, two trains pass a station on the way at the same time, and then move on. How many kilometers is the freight train from B when the passenger train arrives at A? (Nanchang Foreign Language School)
123. The students visited the exhibition hall. Some students ride bicycles, and their speed is 24 kilometers per hour. Some students walk at a speed of 6 kilometers per hour. Starting from the school at the same time, 15 minutes later, students riding bicycles arrive at the exhibition hall. How far is the walking classmate from the exhibition hall? (nanchang district, Wuxi City, Jiangsu Province)
124. Two cars, A and B, leave from two places at the same time. When they met, the distance between A's car shop and B's was better.
125.A train and B train leave from point A in different directions at the same time. Four hours later, car B arrived at point C. At this time, car A traveled 30 kilometers more than car B. It is known that car A can circle the rectangular ring in seven hours. How many kilometers is this ring road? (Xiangshan County, Zhejiang Province)
126. Party A and Party B race around the circular track, and they walk in the same direction from point A at the same time. The ratio of the first section is 4∶5, and the total length of this circular runway is obtained. (Jian 'ou City, Fujian Province)
127. Two cars leave from Party A and Party B at the same time. It is known that a car travels 70 kilometers per hour? (Huangpu District, Guangzhou)
128. Buses and trucks leave from A and B at the same time. It takes 10 hour for the bus to travel completely, and the truck travels 42 kilometers per hour. After 3 hours, the sum of the distances traveled by the two cars is equal to the remaining distance. How many kilometers is it between A and B? (Nanchang qingyunpu district)
129. Two trains, A and B, leave from two stations in opposite directions at the same time. The average speed of train A is 90 kilometers per hour. What is the distance? (Taishun County, Zhejiang Province)
130. On a pedestrian street, the distance between A and B is 600 meters. Zhang Hua walks 4 kilometers per hour and Wang Wei walks 5 kilometers per hour. At 8 o'clock, the two of them set off from A and B at the same time and walked in opposite directions. 1 minute later, they turned around and walked in the opposite direction. After another 3 minutes, they turned around and walked in turn according to 1, 3, 5, 7 ... (consecutive odd numbers) minutes. So when did Zhang Hua and Wang Wei meet at eight o'clock? (School of Foreign Languages, Wuhan University)
13 1. From place A to place B, it takes 6 hours for car A and 10 hours for car B. Two cars leave from place A to place B at the same time, and car A returns immediately after arriving at place B. How many hours after the two cars leave? (Songzi County, Hubei Province)
132. the distance between a and b is 2 10 km. Can a car and b car meet at the same time from a and b respectively? (Qingshan District, Wuhan)
If two cars drive from both ends of this expressway at the same time, how many hours will it take to meet? (Shouchun School in Hefei Central District)
How many square bricks do you need to lay the floor? (Fujian Xiao Yun Experimental Primary School)
135. A cylindrical measuring cup with an inner diameter of 8 cm and an inner height of 16 cm.
136. A cylindrical iron drum without a cover is 24 cm high and the bottom radius is 10 cm. How many square centimeters does it take to make this bucket? (Keep the whole hundred square centimeters) (Central District of Xining City)
137. A wooden box is 9 cm long, 6 cm wide and 4 cm high. How many square meters of boards do you need to make 10 wooden box (with cover)? (Shangyu City, Zhejiang Province)
138. A cylindrical grain depot filled with wheat, with a bottom area of 3.5 square meters and a height of 1.8 meters. If these wheat are piled into a conical wheat pile with a height of 1.5 meters, how many square meters will it occupy? (nanchang district, Wuxi City, Jiangsu Province)
How many cubic decimeters is the volume of an object? (Yanta District, Xi City)
140. A cylindrical barrel with a bottom diameter and a height of 6 decimeters. How many cubic decimeters of water can this barrel hold? (Anyang City, Henan Province)
14 1. A rectangular swimming pool, 50 meters long, 25 meters wide and 2 meters deep.