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The total number of trees in forest Pand...

The total number of trees in forest Pand Q is 560 .After `(3)/(7)` of the trees in forest P and 100 trees in forest Q are cut , the ratio of the number of trees in P to Q becomes `1:4` .Find the number of trees in forest Q before the cutting of threes .

A

420

B

416

C

418

D

120

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