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    Question

    The average age of a class of 35 girls is 27 years. If 7

    new girls having average age of 12 years join the class, then the average age of the class becomes:
    A 9.5 years Correct Answer Incorrect Answer
    B 14 years Correct Answer Incorrect Answer
    C 24 years 5 months Correct Answer Incorrect Answer
    D 13 years Correct Answer Incorrect Answer
    E 22 years 5 months Correct Answer Incorrect Answer

    Solution

    Total age of 35 girls = 35 ×27 = 945 years Total age of 42 girls = 945 + (7×12) = 1029 years Therefore new average age = 1029/42 = 24.5 years

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