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    Question

    The average age of a man and his son is 40 years. The

    ratio of their ages is 11 : 5 respectively. What is the son's age?
    A 25 years Correct Answer Incorrect Answer
    B 20 years Correct Answer Incorrect Answer
    C 28 years Correct Answer Incorrect Answer
    D 14 years Correct Answer Incorrect Answer

    Solution

    Total age = Average age × number of people Total age of man and his son = 40 × 2 ⇒ 80 years Ratio of their ages = 11 : 5 Let the ratio of age of man and son be 11x : 5x ⇒ 11x + 5x = 80 ⇒ x = 5 years Age of son = 5x ⇒ 5 × 5 ⇒ 25 years ∴ The son's age is 25 years.

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