Question

    Average weight of 36 students is 68 kg. When two new

    students with weights (m + 12) kg and (m - 6) kg join, the average weight becomes 69 kg. Find the value of (m - 50).
    A 32 Correct Answer Incorrect Answer
    B 34 Correct Answer Incorrect Answer
    C 34 Correct Answer Incorrect Answer
    D 36 Correct Answer Incorrect Answer

    Solution

    38 × 69 − 36 × 68 = m + 12 + m − 6
    2m + 6 = 2622 − 2448 = 174
    2m = 168
    m = 84
    m − 50 = 34

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