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    Question

    6 years ago ratio of the ages of the two persons A and B

    was 5:2. 4 years hence the ratio of their ages will be 7:4. Find the present age of B.
    A 20 years Correct Answer Incorrect Answer
    B 38 years Correct Answer Incorrect Answer
    C 16 years Correct Answer Incorrect Answer
    D 9 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    6 years ago, Let A’s age be 5x and B’s age be 2x. According to the question, 4 years hence, => (5x + 10)/(2x+10) = 7/4 => 20x + 40 = 14x + 70 => x = 5 Present age of B = 2x + 6 = 2 × 5 + 6 = 16 years

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