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Answer : 3 4 : 5 Explanation : Answer: C) 4 : 5 Explanation: Let their present ages be 13x and 17x.Then, 13x-4/17x-4 = 11/15. Solving this, we get x = 2.Required ratio = 13x2 6/17x2 6 = 32/40 = 4/5.

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