For a pile of coal, 52 tons were transported in the first time, accounting for 2 / 9 of this pile of coal. 10% of this pile of coal was transported in the second time. How many tons were transported in the second time? Practical questions

For a pile of coal, 52 tons were transported in the first time, accounting for 2 / 9 of this pile of coal. 10% of this pile of coal was transported in the second time. How many tons were transported in the second time? Practical questions

52 △ 2 / 9 * 10% = 23.4 tons

Nine tenths of a ton of coal can only be transported one tenth each time?
We need formula and reason! For example, why do we do this?
Er, I'm puzzled about 9 and 10, which is right?

10 times
1 △ 1 / 10 = 10
Or: one tenth of his is 9 / 10 △ 10 = 9 / 100
So 9 / 10 △ 9 / 100 = 10 times

There are two piles of coal. Pile a is 360 tons less than pile B. 700 tons of coal is taken from each pile. Pile B is just three times as much as pile A. how many tons of coal are there in each pile?

360 ÷ (3-1) = 180 tons
A: 180 + 700 = 880 tons
B: 880 + 360 = 1240 tons

Three fourths of the grain stored in warehouse A and two thirds of the grain stored in warehouse B are equal. The ratio between warehouse B and warehouse A is () it is known that there are 360 tons of grain stored in warehouse A and warehouse B. how many tons of grain are stored in warehouse A and warehouse B respectively

9：8