In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?
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hii dear here ur answer!!
____________________
Total student = 100
For 70 students total marks =
75×70
75×70
=5250
=5250
Total marks of girls = & 7200-5250$
=1950
=1950
Average of girls =
1950
30
195030
=65
=65
____________________
Total student = 100
For 70 students total marks =
75×70
75×70
=5250
=5250
Total marks of girls = & 7200-5250$
=1950
=1950
Average of girls =
1950
30
195030
=65
=65
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