The original tonnage ratio of a and B piles of coal is 5:3. If 90 tons are transported from a pile to B pile, then the tonnage of the two piles is equal. How many tons are there in a and B piles?
Suppose that there are x tons of coal in pile a. x-90 = 35x + 9025x = 180X = 450; coal in pile B: 450 × 35 = 270 (tons); answer: there are 450 tons of coal in pile a and 270 tons of coal in pile B
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