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    Question

    The average age of a group of 10 students is 30

    years. Two persons of age 12 years and 10 years, left the group and 2 persons of age 20 years and 12 years, joined the group. Find the new average age of the group.
    A 37 years Correct Answer Incorrect Answer
    B 29 years Correct Answer Incorrect Answer
    C 32 years Correct Answer Incorrect Answer
    D 31 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Required average = {(10 × 30) – 12 – 10 + 20 + 12}/10 = 31 years

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