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    Question

    The average of ten numbers is 80. When five more numbers

    are included, the average increases by 4. Find the average of the numbers included.
    A 90 Correct Answer Incorrect Answer
    B 91 Correct Answer Incorrect Answer
    C 92 Correct Answer Incorrect Answer
    D 93 Correct Answer Incorrect Answer

    Solution

    Sum of the 10 numbers = 80 × 10 = 800
    New average = 80 + 4 = 84
    Sum of 15 numbers = 84 × 15 = 1260
    Sum of new 5 numbers = 1260 - 800 = 460
    Required average = 460 ÷ 5 = 92

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