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    Question

    The average of a set of 's' numbers is 30. If 50 is

    added to the set, then the average of the set becomes 30.2. Find the value of '4 X (s - 5)'.
    A 376 Correct Answer Incorrect Answer
    B 400 Correct Answer Incorrect Answer
    C 350 Correct Answer Incorrect Answer
    D 380 Correct Answer Incorrect Answer
    E 390 Correct Answer Incorrect Answer

    Solution

    Sum of all 's' numbers = 30s
    ATQ:
    (30s + 50) / (s + 1) = 30.2
    Multiplying both sides by (s + 1):
    30s + 50 = 30.2(s + 1)
    30s + 50 = 30.2s + 30.2
    50 - 30.2 = 30.2s - 30s
    19.8 = 0.2s
    s = 99
    4 X (s - 5):
    4 X (99 - 5) = 4 X 94 = 376

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