the average weight of a group of boys and girls is 38kg.the avae
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No. of boys=x
No. of girls=y
Total = x+y
Total weight=38(x+y)
Total weight=42x +33y
38(x+y) = 42x+33y
38x +38y=42x+33y
42x-38x =38y-33y
4x=5y
4x-5 y. =o
If x=25
4x25-5y=0
100-5y=0
5y=loo
y=20
No. of girls=20. Ans
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