the mean weight of 60 students in a class is 40kg.The mean weight of boys is 50kg while that of girls is 30kg.Find the number of boys and girls in the class.
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The mean weight of 60 students in a class =40kg
The mean weight of boys =50kg
The mean weight of girls =30kg
weight of each student =60÷40
=1.5kg
No. of boys = 50kg×1.5kg
=75 boys
No. of girls= 30kg×1.5kg
= 45 girls
Thus, there are 75 boys and 45 girls in the class
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