The weight of a barrel of oil is 1.5 times that of B barrel of oil. If 2.5kg oil is taken out of a barrel of oil, the weight of a and B barrels of oil will be equal Add conditions or questions according to the formula 1. A book has 100 pages, how many pages have you read? 100*1/5：—— 100-100*1/5—— 2. One road is 400 meters long, and one fifth of it has been built? 400*1/5：—— 400-400*1/5：—— ——It needs to be filled in by yourself

The weight of a barrel of oil is 1.5 times that of B barrel of oil. If 2.5kg oil is taken out of a barrel of oil, the weight of a and B barrels of oil will be equal Add conditions or questions according to the formula 1. A book has 100 pages, how many pages have you read? 100*1/5：—— 100-100*1/5—— 2. One road is 400 meters long, and one fifth of it has been built? 400*1/5：—— 400-400*1/5：—— ——It needs to be filled in by yourself

B bucket = 2.5 / (1.5-1) = 5kg a bucket = 5 * 1.5 = 7.5kg1. A book has 100 pages. After reading it, there are only one fifth of the whole book left. How many pages have been read? 100 * 1 / 5: the number of remaining pages is 100-100 * 1 / 5, the number of pages have been read. 2. A road is 400 meters long, one fifth has been repaired, and how many have not been repaired

The weight of barrel a is 1.5 times that of barrel B. If 2.5 kg of oil is taken out of barrel a, the two barrels are equal. How many kg of each barrel are there

Originally, a is 1.5 times of B, so a: B = 3:2 = 6:4
Now a is the same as B, so a: B = 1:1 = 5:5
A is less "1" and 2.5kg, so 2.5 △ 1 × 6 = 15kg
2.5 △ 1 × 4 = 10kg