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    Question

    Sum of ages of 72 workers is 1440 years. The average

    age of 24 of them is 18 years and the average age of another 30 of them is 15 years. Find the average age of the remaining workers.
    A 31 years Correct Answer Incorrect Answer
    B 32 years Correct Answer Incorrect Answer
    C 33 years Correct Answer Incorrect Answer
    D 34 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Given, sum of age of 72 workers = 1440 years
    Sum of age of 24 workers = 24 × 18 = 432 years
    Sum of age of another 30 workers = 30 × 15 = 450 years
    Remaining number of workers = 72 – 24 – 30 = 18
    Average age of remaining 18 workers = {(1440 – 432 – 450)/18} = (558/18) = 31 years

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