Question
In a class of 40 students, the average weight of the
boys is 48 kg, and the average weight of the girls is 56 kg. If the overall average weight of the class is 50.4 kg, determine the number of boys in the class.Solution
Applying allegation method, we get
Desired ratio = 5.6:2.4 = 7:3
Number of boys in the class = 7/10 x 40 = 28
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