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    Question

    The average of eight numbers is 50. When four more numbers

    are included, the average increases by 3. Find the average of the numbers included.
    A 56 Correct Answer Incorrect Answer
    B 57 Correct Answer Incorrect Answer
    C 58 Correct Answer Incorrect Answer
    D 59 Correct Answer Incorrect Answer

    Solution

    Sum of the 8 numbers = 50 × 8 = 400
    New average = 50 + 3 = 53
    Sum of 12 numbers = 53 × 12 = 636
    Sum of new 4 numbers = 636 - 400 = 236
    Required average = 236 ÷ 4 = 59

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