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