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    Question

    The average age of a group of 20 students is 30

    years. Two persons of age 50 years and 60 years, left the group and 2 persons of age 50 years and 40 years, joined the group. Find the new average age of the group.
    A 23 years Correct Answer Incorrect Answer
    B 25 years Correct Answer Incorrect Answer
    C 27 years Correct Answer Incorrect Answer
    D 29 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Required average = {(20 × 30) – 50 – 60 + 50 + 40}/20 = 29 years

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