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    Question

    The average age of A, B and C is 30 years, while the

    average age of B, A and D is 24 years. If the ratio of the age of C and D is 5:3, respectively, then find the age of D.
    A 27 years Correct Answer Incorrect Answer
    B 23 years Correct Answer Incorrect Answer
    C 24 years Correct Answer Incorrect Answer
    D 20 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of ages of A, B and C = 30 ├Ч 3 = 90 years Sum of ages of B, A and D = 24 ├Ч 3 = 72 years So, C тАУ D = 90 тАУ 72 = 18 years Let the age of C and D be 5x and 3x years, respectively. 5x тАУ 3x = 18 2x = 18 x = 9 So, age of D = 3x = 27 years.

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