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Total students = 60 so we have 3 girls for 7 boys so no of girls = 3x no of boys = 7x

Given ratio of girls and boys are=3:7 ratio of boys is =7x ratio of girls is =3x total=60 sum of ratio of boys and girls =total 7x+3x=60 10x=60 x=6 sub x in ratio of boys boys=7x 7(6) 42 is answers