Question
If the average of 38, 49, 42, and 'b' is 50, then find
the value of '2b'.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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