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    Question

    The ratio of A and B present age is 7:3. The product of

    their ages is 8400. What will be the ratio of their ages after 4 years?
    A 17:11 Correct Answer Incorrect Answer
    B 9:4 Correct Answer Incorrect Answer
    C 13:8 Correct Answer Incorrect Answer
    D 5:3 Correct Answer Incorrect Answer

    Solution

    Let their present age be 7x and 3x respectively. Product of their ages = 21x² = 8400 => x² = 400 => x = 20 Present age of A = 7x = 140 years Present age of B = 3x = 60 years Ratio of their ages after 4 years = (140+4) : (60+4) = 144:64 = 9:4

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