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    Question

    The average of a set of 's' numbers is 60. If 150 is

    added to the set, then the average of the set becomes 60.5. Find the value of '4 X (s - 10)'.
    A 676 Correct Answer Incorrect Answer
    B 700 Correct Answer Incorrect Answer
    C 650 Correct Answer Incorrect Answer
    D 680 Correct Answer Incorrect Answer
    E 690 Correct Answer Incorrect Answer

    Solution

    Sum of all 's' numbers = 60s
    ATQ:
    (60s + 150) / (s + 1) = 60.5
    Multiplying both sides by (s + 1):
    60s + 150 = 60.5(s + 1)
    60s + 150 = 60.5s + 60.5
    150 - 60.5 = 60.5s - 60s
    89.5 = 0.5s
    s = 179
    4 X (s - 10):
    4 X (179 - 10) = 4 X 169 = 676

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