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    Question

    There are 3 members in a family. The average age of the

    father and mother is 40 years. The average age of the father, mother, and daughter is 30 years. Find the age (in years) of the daughter.
    A 6 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 8 Correct Answer Incorrect Answer

    Solution

    The average age of father and mother =40 years Total age of father and mother=40×2=80 years Now, the average age of the father, mother, and daughter =30years. Total age of the father, mother, and daughter =30×3=90years. Age of daughter =90-80=10 years.

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