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    Question

    The average age of a group of 20 students is 40

    years. Two persons of age 44 years and 33 years, left the group and 2 persons of age 45 years and 72 years, joined the group. Find the new average age of the group.
    A 42 years Correct Answer Incorrect Answer
    B 39 years Correct Answer Incorrect Answer
    C 27 years Correct Answer Incorrect Answer
    D 29 years Correct Answer Incorrect Answer

    Solution

    Required average = {(20 × 40) – 44 – 33 + 45 + 72}/20 = 42 years

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