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