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    Question

    The average of a set of 's' numbers is 24. If 40 is

    added to the set, then the average of the set becomes 24.4. Find the value of '4 X (s - 14)'.
    A 100 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 125 Correct Answer Incorrect Answer
    D 150 Correct Answer Incorrect Answer

    Solution

    Sum of all 's' numbers = 24s
    ATQ:
    (24s + 40) / (s + 1) = 24.4
    Multiplying both sides by (s + 1):
    24s + 40 = 24.4(s + 1)
    Simplifying:
    24s + 40 = 24.4s + 24.4
    15.6 = 0.4s
    s = 39
    Noe,4 X (s - 14):
    4 X (39 - 14) = 100

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