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    Question

    Average weight of 50 boxes is 22 kg. Two more boxes of

    weights (z + 7) and (z - 5) are added and the average becomes 22.5 kg. Find (z - 18).
    A 12 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 14 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    52 × 22.5 − 50 × 22 = z + 7 + z − 5
    2z + 2 = 1170 − 1100 = 70
    2z = 68
    z = 34
    z − 18 = 34 – 18 = 16

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