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    Question

    The average age of a group of 20 students is 50

    years. Two persons of age 50 years and 30 years, left the group and 2 persons of age 70 years and 90 years, joined the group. Find the new average age of the group.
    A 47 years Correct Answer Incorrect Answer
    B 54 years Correct Answer Incorrect Answer
    C 52 years Correct Answer Incorrect Answer
    D 51 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Required average = {(20 × 50) – 50 – 30 + 70 + 90}/20 = 54 years

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