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The total number of trees in forest X and forest Y was 1290.
36 trees from forest X and 20% of the trees from forest Y were cut down to build a factory.
As a result , the ratio of the number of trees in forest X to that in forest Y became 7:1.
(a) Find the number of trees in forest X at first.
(b) If 5:1 is the ratio of the number of trees in forest Z to that which forest Y had at first, find the number of trees in forest Z.
Notes to students: