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    Question

    The average age of a class of 20 girls is 16 years. If 4

    new girls having average age of 10 years join the class, then the average age of the class becomes:
    A 12 years Correct Answer Incorrect Answer
    B 16 years Correct Answer Incorrect Answer
    C 15 years Correct Answer Incorrect Answer
    D 14 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total age of 20 girls = 20 × 16 = 320 years Total age of 24 girls = 320 + (4 × 10) = 360 years Therefore new average age = 360/24 = 15 years

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