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    Question

    In a housing block having 150 occupants, the average

    weight of the occupants is 50.9 kg. If 10% of the occupants are senior citizens whose average weight is 68 kg and 40% of the occupants are of age less than 18 years whose average weight is 32 kg, then find the average weight of the remaining persons (in kg).
    A 63.25 Correct Answer Incorrect Answer
    B 62.25 Correct Answer Incorrect Answer
    C 62.75 Correct Answer Incorrect Answer
    D 62.6 Correct Answer Incorrect Answer

    Solution

    Total weight of 150 occupants = 150 ├Ч 50.9 = 7635 Number of senior citizen occupants = 10/100 ├Ч 150 = 15 Average weight of senior citizen occuoants = 68 ├Ч 15 = 1020 Number of occupants less than 18 years = 40/100 ├Ч 150 = 60 Total weight = 60 ├Ч 32 = 1920 kg Average weight of remaining persons = (7635 - 1020 - 1920)/(150 - 15 - 60) = 4695/75 = 62.6

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