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    Question

    The average age of a group of 20 students is 25

    years. Two persons of age 40 years and 30 years, left the group and 2 persons of age 60 years and 50 years, joined the group. Find the new average age of the group.
    A 24 years Correct Answer Incorrect Answer
    B 25 years Correct Answer Incorrect Answer
    C 27 years Correct Answer Incorrect Answer
    D 21 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Required average = {(20 × 25) – 40 – 30 + 60 + 50}/20 = 27 years

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