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    Question

    The average of four numbers is 68. When four more

    numbers are included, the average increases by 6. Find the average of the numbers included.
    A 78 Correct Answer Incorrect Answer
    B 79 Correct Answer Incorrect Answer
    C 80 Correct Answer Incorrect Answer
    D 81 Correct Answer Incorrect Answer

    Solution

    Sum of the 4 numbers = 68 ├Ч 4 = 272
    New average = 68 + 6 = 74
    Sum of 8 numbers = 74 ├Ч 8 = 592
    Sum of new 4 numbers = 592 - 272 = 320
    Required average = 320 ├╖ 4 = 80

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