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?
3. 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?
4. 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?
5. 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?
The chemical fertilizer plant planned to produce 84 tons of chemical fertilizer in 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?
7, processing a batch of clothes, processing 300 sets a day, 16 days can be completed,
(1) If 400 sets are processed every day, how many days will it be completed in advance?
(2) If 20 sets are processed every day, how many days can it be completed?
(3) If it is to be completed five days in advance, how many sets will be processed every day?
8. A car factory planned to produce16,800 cars throughout the year, and as a result, the annual production task was completed two months ahead of schedule. At this rate, how many cars can be produced throughout the year?
9. A workshop of Xinfeng Agricultural Machinery Factory processes 2480 parts. Originally, 100 pieces were processed every day, and the work was completed.
After 20 days, it will be changed to 120 pieces per day. So we can finish the task in a few days.
10, a clothing factory used to make a children's dress, using 2.2 meters of cloth each 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?
1 1. 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?
12, students carry water to water trees. Forty-five trees were watered in the third grade, 10 fewer trees were watered in the third grade than in the fourth grade, and half fewer trees were watered in the fourth grade than in the fifth grade. How many more trees are watered in the fifth grade than in the third grade?
13, two engineering teams jointly opened a tunnel, each digging from one end. The first team drives 12.6 meters every day, and the second team drives 14.4 meters every day. Five days after the first team dug, the second team joined, and the 2 1 day tunnel was finally opened.
How long is this tunnel? (2) How many meters did the two teams dig when they got through?
14, the speed of the car is 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.
(1) How many hours did you meet?
(2) How many kilometers did the two cars travel when they met?
15, the printing factory printed 8540 books in 4 hours. According to this calculation, how many books can be printed in three hours?
16, the fruit shop shipped 2,488 kilograms of apples, four times as much as bananas, and the bananas shipped were 307 kilograms less than oranges. How many kilograms of apples and oranges did the fruit shop send?
17. It takes 13 hours to get from A to B by train, and the local train is 99 kilometers per hour. If you change to the express train, it's 44 kilometers faster than taking the local train. How many hours does it take by express train?
18, physical education class students line up. There are 8 boys in the first team, and 4 girls are arranged between every 2 boys. How many girls are there in Class One?
19. The watch factory wants to produce a batch of watches. It was originally planned to produce 672 watches a day, which was completed in 15 days. Actually completed 3 days ahead of schedule, how many pieces are actually produced every day?
20. The price of three tape recorders is less than that of 1 black and white TV set by 52 yuan, and the price of five black and white TV sets is equivalent to that of 1 color TV set. How much is each tape recorder 187 yuan and color TV?
2 1, fishing in Dongkeng Reservoir, the first time caught 2970 Jin less than the second time, the second time caught 2970 Jin less than the first time 170 Jin, how many Jin did you catch the second time?
2 1 Is it enough?
If it's not enough, say it again
1 two lines, one is 2 1 m long and the other is 18 m long. After cutting two wires with the same length, the remaining length ratio of these two wires is 10:7. How long is the cutting part?
2 from a to b is * * 150km, all uphill and downhill. It takes 4: 30 for trucks to go from A to B, and 5: 30 for trucks to go from B to A. It is also known that the downhill speed is three times the uphill speed. How many kilometers is the uphill road from A to B?
3. Processing a batch of parts can be completed within 24 hours. Now Party A works alone for 16 hours, and then Party B works alone for 12 hours, leaving 2/5 unfinished. It is known that Party A processes three more parts per hour than Party B. How many parts are there in this batch?