There are two groups of workers, the ratio of work efficiency is 7:8, the ratio of number of workers is 5:6, and the ratio of working hours is 12:11

There are two groups of workers, the ratio of work efficiency is 7:8, the ratio of number of workers is 5:6, and the ratio of working hours is 12:11

7 × 12 × 5 = 4208 × 11 × 6 = 528420:528 = 35:44 A: the ratio of the two groups was 35:44

11. There are two groups of workers, the efficiency ratio is 7:8, the man to man ratio is 5:6, and the working time ratio is 12:11

（7/8）*（12/11）=21/22
7 / 8 is the proportion between the two groups of workers, the two groups as a whole, has nothing to do with the number of each group

To transport 300 tons of coal, team a transported 1 / 5, team B transported 3 / 4 of team a, how many tons did Team B transport?
See clearly

300*1/5*3/4=45

There are 46 tons of coal in pile a and pile B, one fifth of which is transported from pile a, and 10 tons is transported from pile B. the two pairs are now the same weight, and the coal in pile a used to be () tons

There are 46 tons of coal in a and B piles, a + B = 46, 1 / 5 in a pile is equal to 10 tons in B pile, and (4 / 5) a = B - 10, then, 4 / 5 in a pile plus 10 tons is equal to the original in B pile, and the original in a pile is 46 tons, a + (4 / 5) a + 10 = 46 (9 / 5) a = 36 (1