2. build a road. It was originally planned to build 0.4 kilometers a day, which can be completed in 70 days. The actual number of meters repaired every day is 1.25 times as planned. How many days will it actually take to complete?
3. The greening team plans to plant trees and complete the task in 8 days. Actually, 240 trees were planted every day, and all the tree planting tasks were completed in 7 days. How many more trees are actually planted every day than planned?
4. A neighborhood committee expressed condolences to the families of martyrs and sent them brown sugar and white sugar. 2 bags of brown sugar and 5 bags of white sugar were distributed to every household. When they delivered it to the last household, the brown sugar had just arrived, and there were 10 bags of white sugar left. It is known that the number of bags of white sugar is three times that of brown sugar, so how many bags of brown sugar and white sugar do you bring?
The clothing factory has to process a batch of clothes. The first workshop and the second workshop were processed at the same time for 60 days, which has just been completed. It is known that the clothing processed in the first workshop accounts for 45% of the total clothing, and the second workshop processes 132 pieces every day. How many pieces are processed in the first workshop every day?
The washing machine factory plans to produce a batch of washing machines. Results 37.5% of the plan was completed in 9 days. According to this calculation, how many days will it take to complete the plan?
7. There is a pile of coal that can be burned 120 days. Due to the improvement of coal-burning technology, 0.25 tons of coal was saved every day, and as a result, this pile of coal burned 150 days. How many tons is this pile of coal?
Take seven yellow cattle and put them in the buffalo herd, so that the heads of the three cows are exactly the same. How many cows are there?
9. Workshop A and Workshop B process a batch of the same parts. If workshop A processes 35 pieces first, and then workshop B
First process 1 day, and then start processing in the second workshop. After 5 days, the number of parts processed in the two workshops is equal. So how many parts does workshop B process in a day?
10. The highway team originally planned to repair the 9 1200m highway in 240 days. Actual daily meter
12. Grass100kg, with water content of 66%. After drying, the water content decreased to 65438 05%. How many kilograms do these grasses weigh after drying?
13. Reduce one side of the square by 1/5 and increase the other side by 4 meters to get a rectangle. This rectangle has the same area as the original square. So how many square meters is the square area?
14. A workshop processes A and B parts. Part a accounts for 30% of the processing part, and then 24 parts b are processed, at which time part a accounts for 25%. So how many two kinds of parts have been processed now?
15. Party A, Party B and Party C * * * produced 1760 pieces. If Party A produces 2/9 less and Party B produces 80 more, then the number of parts produced by Party A, Party B and Party C is equal. How much did A, B and C each produce?
16. Xiaoming's age this year is 65438+ 0/6 of his father's age. 15, his age is 4/9 of his father's age. How old are Xiaoming and his father this year?
17. Students in a school are 3 14, among which 2/3 of boys are 40 less than 0.4/5 of girls. How many boys and girls are there in this school?
18. Class A and Class B have the same number of students, and some students in each class participated in the math group. The number of people in class A who participated in the math group was exactly1/3 of the number of people in class B who did not participate in the math group; The number of people who participated in the math group in Class B is exactly 0.4 of the number of people who did not participate in the math group in Class A+65438+A ... So, how many people who did not participate in the math group in Class A are from Class B?
19. There are several liters of alcohol solution in the container. After adding 1 liter of water, the pure alcohol content is 25%; Add 1 liter of pure alcohol, and the content of pure alcohol in the container is 40%. So how many liters of alcohol solution were there in the original container? What is the concentration?
20. Party A, Party B and Party C can finish copying a manuscript within 1 hour. If Party A and Party B copy together, it will take 80 minutes to complete; If B and C are copied together, it will take 100 minutes to complete. If this manuscript is copied by B alone, how many hours will it take to finish?
2 1. A single project can be completed in 20 days; B alone can be completed in 30 days. Now working together, the middle one rested for 3 days, and the second one rested for several days. It took 16 days to complete. B how many days did you rest?
22. It takes 8 hours to fill a pool of water and only open one pipe; It takes 12 hours to open only the second pipe; It takes 15 hours to open only the C tube. Starting today, only two pipelines A and B were opened, then two pipelines A and B were closed in the middle, and then pipeline C was opened. It takes 65,438+00 hours to fill a pool of water. So how many hours does it take to open the C pipe and inject water?
23. It takes 12 days for an engineering team to undertake a project. If only two teams, A and B, are allowed to exchange work contents, the whole project will be delayed for three days. If the two teams A and B are allowed to exchange work contents, and the two teams C and D are also allowed to exchange work contents, then the whole project can still be completed as scheduled. If only C and D teams are allowed to exchange work contents, the whole project can be completed a few days in advance.
24. Team A and Team B cooperate on a project. After team A worked alone for 6 days, team B joined in and worked with team A, and it took another 4 days to complete 1/3 of the whole project. After another 10 day, the whole project was completed by 3/4. Because group A has another task, group B will continue to work until the whole project is completed. How many days did it take from the beginning to the end?
25. Party A and Party B leave from A and B at the same time and go to B and A respectively, with the speed ratio of 7: 6. After meeting, they moved on, and then B's speed increased every hour.
The speed of coming.
On weekdays, two cars, A and B, leave from City A and City B at the same time, in opposite directions, and meet after 6 hours. One day, car A broke down on the road and was repaired for 2.5 hours. As a result, it took 7.5 hours for the two cars to meet. So how many hours does it take for a train to leave from city A to city B on this day?
27. In a certain city, the starting station and the terminal of 104 tram run at a constant speed at regular intervals. Zhang Hua rode at a constant speed along the 104 tram line. Every 12 minutes, a tram overtook him from behind, and every 4 minutes, a tram came head-on. So, how many minutes does the 104 tram start and end?
28. The walking speed ratio of Party A and Party B is 1 1: 7. The two took opposite directions from A and B, and met two hours later. If two people go in the same direction, will A catch up with B in a few hours?
29.45 Students are going to work in the suburbs 30 kilometers away from the school. There is only one car in the school that can take 15 people, and the speed is 60 km/h. The speed at which students walk is 4 kilometers per hour. It will take them at least a few hours to get to the workplace as soon as possible.
30. The students of Class A and Class B leave school at the same time and go to the Children's Palace. The walking speed of Class A is 5 kilometers per hour, and that of Class B is 6 kilometers per hour. There is a car in the school that can just take a class of students. This car travels 30 kilometers per hour. What is the walking distance ratio between Class A and Class B in order to get the students from the two classes to the Children's Palace as soon as possible?
3 1. A car from A to B can arrive 1 hour earlier than the original time if its speed is increased by 20%. If you drive at the original speed of120km and increase the speed by 25%, you can arrive 40 minutes earlier than the original time. What is the distance between a and b?
32. There is an expressway from City A to City B, which is divided into three sections, of which the first section is twice as long as the third section. On the first section of the road, the speed of the car is 40 kilometers per hour; On the second section of the road, the speed of the car is 90 kilometers per hour; On the third road, the speed of the car is 50 kilometers per hour. At present, two cars are leaving from A and B at the same time, and1/will meet at the second section 1/3 (1/3 from A to B) in 20 minutes. So how many kilometers is it between A and B?
33.A car and B car leave from A to B at the same time. After driving at the original speed of 2/3 of the whole journey, the speed of car A increased by 1 times, and the result was that it arrived at place B two hours earlier than originally planned. The speed of car B has been increased by 1 times after driving at the original speed of 30 km/h/4. As a result, the two cars arrived at B at the same time. So how many kilometers does A plan to drive every hour?
There are long-distance buses running at a fixed speed between city A and city B.. If the speed is 6 kilometers faster than the original speed, you can arrive 20 minutes earlier. If the speed is 5 kilometers slower than the original speed, it is 24 minutes late. What is the distance between a and b?
35. A, B and C had a bicycle race. As a result, A arrived at the finish line 24 minutes earlier than B and B, and 6 minutes earlier than C. We also know that A is 5 kilometers faster than B, B is faster than C 1 km, and what is the distance between A, B and C?
Elementary school mathematics required application problem 2 1. In order to welcome the May Day International Labor Day, the workers' uncles will install colored lights around the workers' club (the ground is not installed on all sides). It is known that the workers' club is 90cm long, 55cm wide and 20cm high. How long will it take the worker's uncle at least?
2. To make a glass counter with a length of 2.2 meters, a width of 40 centimeters and a height of 80 centimeters, the canteen should first install angle irons around the counter. How many meters of angle iron does this counter need?
3. How many square meters of cloth (bottomless) does Liang Liang's family need to change a simple wardrobe with a length of 0.75m, a width of 0.5m and a height of 1.6m?
4. A cubic gift box with a length of1.2cm. How many square meters of wrapping paper does it take to package this gift box?
The glass fish tank is a cube with a length of 3 meters. How many cubic decimeters of glass does it take to make this fish tank? There is no lid on the fish tank.
6. Guanghua Street has installed a new tin mailbox, which is 50 cm long, 40 cm wide and 78 cm high. How many square centimeters of iron does it take to make this mailbox?
7. A rectangular biscuit box, length 10cm, width 6cm and height 12cm. If a circle of trademark paper is attached around (not up and down), what is the area of this trademark paper at least?
8. The processing factory should process batches of washing machines (bottomless). The length, width and height of each washing machine are 59.5cm, 42.5cm and 80cm respectively. How many square meters of cloth does it take to make 1000 sets?
9. A new swimming pool has been built in the fitness center. The swimming pool is 50 cm long, twice as wide and 2.5 cm deep. Now you need to put tiles around and at the bottom of the pool. How many square meters of tiles do you need to paste?
10, the school needs to paint the new classroom. It is known that the classroom is 8m long, 6m wide and 3m high, and the area excluding doors and windows is11.4m2.. If 4 yuan paints every square meter, how much will it cost to paint this classroom?
1 1, a cuboid wood with a length of 5 meters and a cross-sectional area of 0.06 square meters. What is the volume of this piece of wood?
12. The furniture factory ordered 500 squares, each with a cross-sectional area of 24 square decimeters and a length of 3 meters. How many cubic meters is this wood?
13. If a packing box is 28 cm long and 20 cm wide from the inside, its volume is 1 1.76 cubic decimeter. Dad wants to use it to package a glassware with a length of 25cm, a width of 16cm and a height of 18cm. Can you adapt?
Before Children's Day 14, representatives of primary school students in the city built an Olympic wishing wall with a length of 6m, a height of 2.7m and a thickness of 6cm in the center of the square. How many bricks are used in this wall?
15. A fence with a length of 15m, a thickness of 24m and a height of 3m should be built in the south of the park. If 525 bricks are used per cubic meter, how many bricks are used in this fence?
16, the sum of the side lengths of a cuboid and a cube is equal. Given that the length, width and height of a cuboid are 6dm, 5dm and 4dm respectively, what is the side length of a cube? Are they equal in volume?
17, the fuel tank on the car, with a length of 5dm, a width of 4dm and a height of 2dm. How many liters of gasoline can this tank hold?
18, rectangular glass container, length and width are 2dm from the inside. I want to pour 5L of water into the container, and then put a potato in the water. At this time, the measured water depth in the container is 13cm. How big is this apple?
19, backpack sprayer, volume of liquid medicine tank 14L. If 700ml of medicine is sprayed every minute, how many minutes does it take to finish spraying a box of medicine?
20. Microwave oven. The product manual indicates that the internal dimension of cranial cavity is 400*225*300 (unit: mm). What is the volume of this microwave oven?