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Solution -
total student =60
Ratio of the girls and boys=3:2
Girls =3/5) ×60=36
Boys =24.
Average marks in physics 24 boys =72
Total marks in physics of 24 boys =72×24=1728
average marks scored by the whole class in Physics = 81
Total marks scored by whole class =81×60=4860
Total marks scored by girls =4860-1728=3132
Average marks in physics of 36 girls=
3132/36=87
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