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    Question

    The average weight of a group of (x - 3) employees is (x

    + 4) kg. If a manager of weight 54 kg joins the office, then average weight of the group increased by 1 kg. Find the strength of the group excluding the manager.
    A 23 Correct Answer Incorrect Answer
    B 13 Correct Answer Incorrect Answer
    C 53 Correct Answer Incorrect Answer
    D 17 Correct Answer Incorrect Answer

    Solution

    ATQ, Total weight of the group = (x - 3) ├Ч (x + 4) kg Weight of office manager = 54 kg According to question, {(x - 3)(x + 4) + 54}/{(x тАУ 3) + 1} = (x + 4) + 1 (x - 3)(x + 4) + 54 = (x + 4)(x тАУ 3) + (x тАУ 3) + (x + 4) + 1 54 = 2x + 1 + 1 2x = 54 тАУ 2 x = 52/2 x = 26 So, strength of group = 26 тАУ 3 = 23

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