If pile a is transported to pile B for 10 tons, pile a will be 5 tons less than pile B. now after the same several tons are transported from both piles, the remaining 1720 tons in pile B is pile A. at this time, how many tons of coal is left in pile a?

(10 × 2-5) / (1-1720) = 15 × 203, = 100 tons

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