The ratio of number of girls to number of boys is 3: 2 in a class of 70 students. The average marks scored by the boys in Physics is 72 and the average marks scored by the whole class in Physics is 80. What is the average mark in Physics scored by girls?
Total student =70 Ratio of the girls and boys=3:2 Girls =3/5) ×70=42 Boys =28. Average marks in physics 28 boys =72 Total marks in physics of 28 boys =72×28=2016 average marks scored by the whole class in Physics = 80 Total marks scored by whole class =80×70=5600 Total marks scored by girls =5600-2016=3584 Average marks in physics of 42 girls=3584/42=85.3
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