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    Question

    The average of four numbers is 58. When four more numbers

    are included, the average increases by 4. Find the average of the numbers included.
    A 62 Correct Answer Incorrect Answer
    B 64 Correct Answer Incorrect Answer
    C 66 Correct Answer Incorrect Answer
    D 68 Correct Answer Incorrect Answer

    Solution

    Sum of the 4 numbers = 58 × 4 = 232
    New average = 58 + 4 = 62
    Sum of 8 numbers = 62 × 8 = 496
    Sum of new 4 numbers = 496 - 232 = 264
    Required average = 264 ÷ 4 = 66

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