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    Question

    The average of 30 numbers is 60. The average of first

    16 numbers is 64 and that of the last 16 numbers is 56. If 15th number and 16th numbers are excluded, then what is the average of the remaining numbers?
    A 59 Correct Answer Incorrect Answer
    B 60 Correct Answer Incorrect Answer
    C 61 Correct Answer Incorrect Answer
    D 58 Correct Answer Incorrect Answer

    Solution

    Sum of 30 numbers = 30 ├Ч 60 = 1800 Sum of 15th and 16th number = 64 ├Ч 16 + 56 ├Ч 16 тАУ 1800
    = 120 ├Ч 16 тАУ 1800
    = 1920 тАУ 1800
    = 120 Desired average = (1800 тАУ 120)/(30 тАУ 2) = 60

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