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    Question

    A group of people contains men, women, and children. If

    40% of them are men, 35% are women, and the rest are children, and their average weights are 70 kg, 60 kg, and 30 kg, respectively. The average weight of the group is:
    A 45.5 kg Correct Answer Incorrect Answer
    B 56.5 gm Correct Answer Incorrect Answer
    C 45.5 gm Correct Answer Incorrect Answer
    D 56.5 kg Correct Answer Incorrect Answer

    Solution

    ATQ,

    Given: Men = 40%, weight = 70 kg Women = 35%, weight = 60 kg Children = 100% - (40% + 35%) = 25%, weight = 30 kg Use weighted average formula:Average weight =(0.40×70)+(0.35×60)+(0.25×30) =28+21+7.5 = 56.5kg

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