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    Question

    The average age of a group of 20 students is 40 years.

    Two persons of age 35 years and 30 years, left the group and 2 persons of age 40 years and 85 years, joined the group. Find the new average age of the group.
    A 37 years Correct Answer Incorrect Answer
    B 31 years Correct Answer Incorrect Answer
    C 43 years Correct Answer Incorrect Answer
    D 40 years Correct Answer Incorrect Answer

    Solution

    Required average = {(20 × 40) – 35 – 30 + 40 + 85}/20 = 43 years

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