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    Question

    Sum of ages of 70 members is 1400 years. The average

    age of 25 of them is 16 years and average age of another 25 of them is 12 years. Find the average age of the remaining members.
    A 33 years Correct Answer Incorrect Answer
    B 36 years Correct Answer Incorrect Answer
    C 37 years Correct Answer Incorrect Answer
    D 39 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Given, sum of age of 70 members = 1400 years
    Sum of age of 25 members = 25 × 16 = 400 years
    Sum of age of another 25 members = 25 × 12 = 300 years
    Remaining number of members = 70 – 25 – 25 = 20
    Average age of remaining 20 members = {(1400 – 400 – 300)/20} = (700/20) = 35 years

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