) The purchase price of a store is 1200 yuan, with a marked price of 2400 yuan, and the profit is 20% when it is sold at a discount. At what discount is this product sold? (2) By reducing the price by 20% to promote a certain commodity, the sales volume increased by 20%. As far as the income of this product is concerned, is this promotion successful? (3) A store sells two pieces of clothes, but for some reason, the lower purchase price leads to a loss 10 yuan, and the higher purchase price leads to a profit of at least 20%, so that there will be no loss after the two pieces of clothes are sold. What is the higher purchase price? (4) The price of a commodity delivered by a shopping mall is 6.4% lower than the original purchase price, which increases the profit by 8 percentage points. Find the original profit rate of distributing this commodity. [5] There are two bags of rice. The weight of rice in bag A is 1.2 times that of bag B. If you put another 5 kilograms of rice in the bag, the two bags will be heavy. How many kilograms are there in two bags of rice [6] A unit sent someone to repair the water conservancy project to complete the task of digging and transporting soil. If each person digs five or three times a day, how can the number of people digging and transporting soil get the dug soil away in time? [7] Buy 18 yuan 1kg of tea and 16 yuan 1kg of tea * * *10kg. Need 142 yuan. How many kilograms do you buy each of these two teas? [8] A rectangular iron sheet, 32CM long and 24CM wide, with the same small squares cut off at all four corners, is folded to make an iron box without a cover, so that the bottom area is half of the original area, and the height of the box is obtained. [9] Xiaoming keeps a group of pigeons. Liang Xiao asked Xiao Ming how many pigeons he had. Xiao Ming said, "If you give me a pigeon, the square of the total number of pigeons is exactly 9 times the total number of pigeons." Do you know how many pigeons Xiaoming has? [10] Party A and Party B jointly do a job, which is expected to be completed in a few days. If Party A does it alone, it will take 18 days; if it takes 32 days, how many days will it take to ask Party A to complete it alone?

1 1, a book of 192 pages, I finished it on the first day, and the rest on the second day. How many pages are left?

12, Xiaoying has 128 pictures. Give all of them to A first, the rest to B, the rest to C. How many pictures does Xiaoying have left?

13. Forty-eight sixth-grade students from a school participated in after-school groups, including basketball team, volleyball team and chess activities. What is the number of students who take part in chess activities?

14, someone went from a to b, completed the journey on the first day, and then completed the journey every day, asking when to complete the journey that day.

15. A pair of trousers, 90 yuan, is a coat. Do you want to know the price of this coat?

16. Repair a section of road. I repaired 80 meters on the first day, but there is still work to be done. How long is this paragraph?

17, a copper wire, used, and rice leftover, for the whole length?

18. There are 4 hectares of orchards in Zhang Cun. Apple trees occupy the orchard area, while pear trees occupy it. How many hectares of pear trees are there?

19. In a math contest, three students won the first prize, accounting for the number of second prizes, and the number of second prizes accounted for the number of third prizes. Find the total number of winners.

20. Party A, Party B and Party C type a manuscript. Party A has finished it all, Party B has finished it all, and Party C has finished the remaining 45 pages. How many pages do you want in this manuscript?

2 1, Party A, Party B and Party C type a manuscript, Party A completes it all, Party B completes it all, and two people * * * complete it130th page. How many pages are there in this manuscript?

22. Students work in groups. There are 30 people in Group A, which is Group B, and Group B is Group C. How many people are there in Group C?

23. Put the red, yellow and white balls together. Red ball 15 is the number of white balls and the number of white balls is the number of yellow balls. How many yellow balls are there?

24. The sum of a number and this number is 44 more than this number. What is the number of balls?

25. Car A runs straight from A to B, 5 kilometers from the midpoint. How far is the ball between A and B?

26. A car travels from A to B, with a journey of 15km, and then arrives at B. Find the distance between A and B. ..

27. Building a road, 403 meters have been built, and those that have not been built are 290 meters more than this road. How long is this road?

28. Xiaohong read a book the day before yesterday. Yesterday she read 65 pages more than the day before yesterday, and didn't read the whole book. How many pages are there in this book?