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    Question

    The average age of A, B and C is 25 years, while the

    average age of B, A and D is 21 years. If the ratio of the age of C and D is 5:3, respectively, then find the age of D.
    A 15 years Correct Answer Incorrect Answer
    B 16 years Correct Answer Incorrect Answer
    C 18 years Correct Answer Incorrect Answer
    D 19 years Correct Answer Incorrect Answer

    Solution

    Sum of ages of A, B and C = 25 ├Ч 3 = 75 years Sum of ages of B, A and D = 21 ├Ч 3 = 63 years So, C тАУ D = 75 тАУ 63 = 12 years Let the age of C and D be 5x and 3x years, respectively. 5x тАУ 3x = 12 2x = 12 x = 6 So, age of D = 3x = 18 years.

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