Question

    The average of six numbers is 66. When two more numbers

    are included, the average increases by 2. Find the average of the numbers included.
    A 72 Correct Answer Incorrect Answer
    B 73 Correct Answer Incorrect Answer
    C 74 Correct Answer Incorrect Answer
    D 75 Correct Answer Incorrect Answer

    Solution

    Sum of the 6 numbers = 66 × 6 = 396
    New average = 66 + 2 = 68
    Sum of 8 numbers = 68 × 8 = 544
    Sum of new 2 numbers = 544 - 396 = 148
    Required average = 148 ÷ 2 = 74

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