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    Question

    The average age of A and B is 22 years. If A is to be

    replaced by C, the average would be 20 years. The average age of C and A is 23 years. Find the age of A.
    A 21 yr Correct Answer Incorrect Answer
    B 23 yr Correct Answer Incorrect Answer
    C 19 yr Correct Answer Incorrect Answer
    D 25 yr Correct Answer Incorrect Answer

    Solution

    A + B = 2 × 22 = 44 yr B + C = 2 × 20 = 40 yr C + A = 2 × 23 = 46 yr On adding all three, 2 (A + B + C) = 44 + 40 + 46 = 130 ⇒ A + B + C = 65 ∴ A = (A + B + C) – (B + C) = 65 – 40 = 25 yr

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