Yang Yi bought 0.25 yuan and ***25 pencils from 0.3 yuan, and paid 7 yuan to get back 0.25. How many pencils did he buy each?
3. A rectangular iron plate with a length of 40 cm and a width of 30 cm, the four corners are cut off with a side length of 4 cm, and then welded into a box without a cover. How many liters is its volume?
4. A car traveled192km in the first 3 hours and 58km/h in the last 2 hours. What is the average speed of this car?
Buses and trucks leave from a and b respectively. After three hours of meeting, the two cars moved on. Two hours later, the bus arrived at B, and the truck was 95km away from A. What is the distance between A and B?
6. A plot of land can be plowed for 65,438+00 hours with the first tractor and 8 hours with the second tractor. Now, these two tractors plow together for 65,438+0 hours and 20 minutes. What percentage of this land has been cultivated?
7. A machine factory originally planned to produce 40 machines every day and complete the task in 20 days. If it takes 16 days, what percentage of the original planned daily output should be completed every day?
There is an expressway between 8.8 o'clock. AB and Shenzhen. 7 hours for small car dealers and 9 hours for large car dealers. At present, the cart takes up 3/7 of the whole journey from place A, while the cart takes off from place B relatively. Two cars driving at the same time 1 hour can walk a fraction of the whole journey? How many hours after two cars drive at the same time, do they meet?
9. Xiaoming bought six pencils and four exercise books, each of which cost 0.68 yuan, and each pencil cost 0.24 yuan. Xiao Ming paid 5 yuan money, how much should he get back?
10. The machine tool factory used to know that each machine tool used steel 1.02 tons. After the improved design, each machine tool saves 0. 12 tons compared with the original machine tool. It turns out that 300 machines can be made of steel. How many machines can be made now? 1 1. Two trains, A and B, leave from two places at the same time. The speed of train A is 80 kilometers per hour, and that of train B is 70 kilometers per hour. 12 hours later, the distance between the two trains is still 1 10 km. How many kilometers are there between these two places?
12. Guangming paper mill produced a batch of newsprint, which was originally planned to be completed in 28 days, with a daily output of 12.5 tons. Now it's finished three days ahead of schedule. How many tons are actually produced every day than originally planned?
13. Li Shifu has produced a batch of parts. Three days ago, 126 parts were produced. According to this calculation, it takes 12 days to complete the production task. How many parts are there in this batch?
14. The fertilizer plant planned to produce 84 tons of fertilizer within 30 days, but actually produced 0.2 tons more than planned every day. How many days did it actually finish the task ahead of schedule?
15. A workshop of Xinfeng Agricultural Machinery Factory processes 2480 parts. Originally, 100 pieces were processed every day, and after working for 20 days, 120 pieces were processed every day. So we can finish the task in a few days. 16. A clothing factory used to make a children's dress, using 2.2 meters of cloth at a time. Now the cutting method has been improved, and each set saves 0.2 meters of cloth. The cloth used to make 600 sets of this kind of clothes, how many sets can be made now? 17. Xiaohong bought three exercise books and three new word books, one at 0.36 yuan and the other at 0.32 yuan. How much did Xiaohong spend less on new word books than on exercise books?
18. Students carry water to water trees. There are 45 trees watered in the third grade, and the number of trees watered in the third grade is less than that in the fourth grade 10, and the number of trees watered in the fourth grade is half that in the fifth grade. How many more trees are watered in the fifth grade than in the third grade? 19. The car travels 63 kilometers per hour, and the speed of the car is 1.4 times that of the truck. They started from two places 270 kilometers apart at the same time and drove in opposite directions. How many kilometers did the two cars travel when they met?
20. Students in one class subscribed to two newspapers, 32 for math, 40 for composition and 26 for English. Q: How many people subscribe to both math newspapers and English newspapers?
The price of 2 1. 14 kg of soybeans is equal to the price of 8 kg of peanuts. Known 1 kg peanut ratio 1 kg soybean price 1.2 yuan. What is the unit price of soybeans and peanuts?
22. A rope is wound around the tree 10 cm after being folded three times. If it is 20 cm around the tree after 40% folding, find the circumference and rope length of the tree.
23. The processing of a batch of parts was originally planned to be completed in 15 days, but actually 30 pieces were made every day. Results It took only 10 days to complete the task. How many parts are there in this batch?
24. A parallelogram vegetable is 20 meters underground and 9 meters high. There is a gravel road in the middle, with a width of 1 m. If planting a vegetable with a width of 1 m2 requires 12 seeds, how many seeds does a vegetable need?
25.4 basketballs and 3 volleyballs * * cost14/yuan, 5 basketballs and 4 volleyballs * * cost 180 yuan. How much is basketball and volleyball each?