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    Question

    The average of 25 numbers is 39.4. The average of the

    first 12 numbers is 36.5, and the average of the last 12 numbers is 40.5. Determine the value of the 13th number.
    A 59 Correct Answer Incorrect Answer
    B 67 Correct Answer Incorrect Answer
    C 53 Correct Answer Incorrect Answer
    D 61 Correct Answer Incorrect Answer
    E 69 Correct Answer Incorrect Answer

    Solution

    Sum of 25 numbers = 25 X 39.4 = 985 Sum of first 12 numbers = 12 X 36.5 = 438 Sum of last 12 numbers = 12 X 40.5 = 486 Therefore, required number = 985 - 438 - 486 = 61

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