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    Question

    The average of a set of 's' numbers is 35. If 90 is

    added to the set, then the average of the set becomes 35.5. Find the value of '4 X (s - 15)'.
    A 376 Correct Answer Incorrect Answer
    B 350 Correct Answer Incorrect Answer
    C 390 Correct Answer Incorrect Answer
    D 400 Correct Answer Incorrect Answer
    E 380 Correct Answer Incorrect Answer

    Solution

    Sum of all 's' numbers = 35s
    ATQ:
    (35s + 90) / (s + 1) = 35.5
    Multiplying both sides by (s + 1):
    35s + 90 = 35.5(s + 1)

    35s + 90 = 35.5s + 35.5
    90 - 35.5 = 35.5s - 35s
    54.5 = 0.5s
    s = 109
    4 X (s - 15):
    4 X (109 - 15) = 4 X 94 = 376

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