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    Question

    Sum of ages of 65 students is 1300 years. The average

    age of 25 of them is 16 years and the average age of another 20 of them is 14 years. Find the average age of the remaining students.
    A 29 years Correct Answer Incorrect Answer
    B 30 years Correct Answer Incorrect Answer
    C 31 years Correct Answer Incorrect Answer
    D 32 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Given, sum of age of 65 students = 1300 years
    Sum of age of 25 students = 25 ├Ч 16 = 400 years
    Sum of age of another 20 students = 20 ├Ч 14 = 280 years
    Remaining number of students = 65 тАУ 25 тАУ 20 = 20
    Average age of remaining 20 students = {(1300 тАУ 400 тАУ 280)/20} = (620/20) = 31 years

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