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    Question

    Four years ago from now age of 'A' was 16 years. 'B' is

    8 years younger than 'A'. After how many years from now, ratio of age of 'A' and 'B' will be 7:5 respectively?
    A 6 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 8 Correct Answer Incorrect Answer

    Solution

    Present age of 'A' = 16 + 4 = 20 yearsPresent age of 'B' = 20 - 8 = 12 yearsLet the required time be 'n' years.So, (20 + n) :(12 + n) = 7:5Or, 5 X (20 + n) = 7 X (12 + n)Or, 100 + 5n = 84 + 7nOr, 2n = 16Or, 'n' = 8

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