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    Question

    Ten years ago, the average age of A and B was 12 years.

    The average age of A, B and C now is 22 years. What will be C’s age after 20 years?
    A 21 yrs Correct Answer Incorrect Answer
    B 42 yrs Correct Answer Incorrect Answer
    C 53 yrs Correct Answer Incorrect Answer
    D 31 yrs Correct Answer Incorrect Answer

    Solution

    Sum of present ages of A, B and C = 22 × 3 = 66 years
    Sum of present ages of A and B = 12 × 2 + 20 = 44 years
    Present age of C = 66 – 44 = 22 years
    Desired age = 22 + 20 = 42 years

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