Question
Determine the number of Girls in a school of 60
Student when you know that the average weight of all Student is 50 kgs, the average weight of boys is 65 kgs, and the average weight of Girls is 45 kgs.Solution
ATQ, 
Desired ratio = 3:1 Ratio of number of boys And girls = 1:3 Number of girls in the school is = (3/4) × 60 = 45
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