The sixth grade doesn't need answers to solve equations.

In the sixth grade, the equations listed in the first book of mathematics solved the slightly complicated practical problem of percentage. The third lesson is 1. In February, the canteen used 1.6 tons of coal, saving 20% compared with 1 month. How many tons of coal are used in January? Train speed 106 km, 35% faster than cars. How many kilometers does this car travel per hour? 3. There are 150 students in Qingyun Primary School, which is 20% more than the students who participated in the Fourth Five-Year Plan. How many students participated in the activities of popularizing the law in the fourth five-year plan?

A chemical raw material, the original production cost per ton is 1250 yuan, and now the cost is reduced by 20%. What is the cost per ton now?

A highway has been built for 60 kilometers, which is exactly 70% of the total length. How many kilometers are left on this road?

A car driving from A to B takes 25% of the whole journey in the first hour, 30% of the whole journey in the second hour and 220 kilometers in two hours. How many kilometers is the total length of A and B?

A chemical raw material, the original production cost per ton is 1250 yuan, and now the cost is reduced by 20%. What is the cost per ton now?

6. A canal was repaired in two weeks. In the first week, 55% of the total length was repaired, 480 meters more than in the second week. What is the total length of this canal?

7. There is a batch of goods at the station. If 25% is transported away, it will leave 156 tons. If 9/65,438+06 is shipped away.

How many tons were shipped?

This farm harvested 6.5438+500,000 tons of wheat this year, an increase of 20% over last year. How many ten thousand tons of wheat have been added this year?

9. Xiaogang read a book. On the first day, he read 30% books. The next day, he read 15 fewer pages than the first day. At this time, half of the people have not seen it. How many pages are there in this book?

10, a factory has three workshops, the first workshop produces 330 machine tools a month, accounting for 30% of the monthly output of the whole factory. The monthly output of the second workshop is 3/4 that of the third workshop.

How many machines does the third workshop produce every month?

1 1. The oil yield of soybean is 54%. How many kilograms can 40 kilograms of soybeans be squeezed?

12, the survival rate of Chinese fir trees is 95%, and 285 trees survived on Arbor Day this year. How many trees have been planted?

13, a book has 360 pages. On the first day, I read 40% of the whole book, and the next day, I read 25% of the whole book. How many pages are left?

14, 40% of a plot is planted with wax gourd, and the rest is planted with tomatoes and eggplant in a ratio of 3: 2. It is known that eggplant is planted in 0.6 hectares. How many hectares is this land?

15, Xiaojun reads story books. On the first day, he read 42 pages, and the next day, he read 43 pages, leaving 83% of the books unread. How many pages does this story book have?

16, a pile of coal, used 20 tons, and the rest used 25%. How many tons is this pile of coal?

17, Youth Farm harvested 8.5 hectares of wheat on the first day, and harvested 20% more on the second day. How many hectares were harvested on the second day?

18. A pig farm raised 400 pigs this year, 25% more than last year. How many pigs were raised last year?

19, a rope, cut off 60% of the total length, leaving12m. How long was the original rope?

20. A wire is 1.2 meters long. After cutting off 20%, cut off another 0.2 meters. How many meters are left?

2 1, 60 kilometers of expressway was built, which is exactly 70% of the total length. How many kilometers is this highway?