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    Question

    The average of three numbers is 66. When three more numbers

    are included, the average increases by 6. Find the average of the numbers included.
    A 78 Correct Answer Incorrect Answer
    B 80 Correct Answer Incorrect Answer
    C 82 Correct Answer Incorrect Answer
    D 84 Correct Answer Incorrect Answer

    Solution

    Sum of the 3 numbers = 66 × 3 = 198
    New average = 66 + 6 = 72
    Sum of 6 numbers = 72 × 6 = 432
    Sum of new 3 numbers = 432 - 198 = 234
    Required average = 234 ÷ 3 = 78

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