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    Question

    The average weight of 36 students in a class is 62 kg.

    When two new students having weights (m + 8) kg and (m − 6) kg joined, the average weight dropped by 1 kg. What is the value of (m − 30)?
    A 12 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D 16 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    38 × 61 − 36 × 62 = m + 8 + m − 6 Or, 2m + 2 = 2318 − 2232 Or, 2m = 84 Or, 'm' = 42 Therefore, required value = 42 − 30 = 12

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