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    Question

    If the average of 38, 49, 42, and 'b' is 50, then find

    the value of '2b'.
    A 142 Correct Answer Incorrect Answer
    B 165 Correct Answer Incorrect Answer
    C 120 Correct Answer Incorrect Answer
    D 124 Correct Answer Incorrect Answer

    Solution

    ATQ, 38 + 49 + 42 + b = 50 × 4 Or, 129 + b = 200 Or, 'b' = 71 Therefore, the required value = '2b' = 2 × 71 = 142

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