the average weight of a group of boys n girls is 38 kg.the average weight of boys is 42 kg and that of girls is 33kg .if the number of boys is 25 than find the number of girls
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Let number of girls =x=x
Total weight of boys =42×25=1050=42×25=1050
Total weight of girls =33x=33x
Total weight of boys and girls =1050+33x=1050+33x ---(1)
average weight of a group of boys and girls is 38 kg
=> Total weight of boys and girls =38(25+x)=38(25+x) ---(2)
From (1) and (2)
1050+33x=38(25+x)1050+33x=950+38x5x=100x=201050+33x=38(25+x)1050+33x=950+38x5x=100x=20
Total weight of boys =42×25=1050=42×25=1050
Total weight of girls =33x=33x
Total weight of boys and girls =1050+33x=1050+33x ---(1)
average weight of a group of boys and girls is 38 kg
=> Total weight of boys and girls =38(25+x)=38(25+x) ---(2)
From (1) and (2)
1050+33x=38(25+x)1050+33x=950+38x5x=100x=201050+33x=38(25+x)1050+33x=950+38x5x=100x=20
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