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2014-10-05T14:35:15+05:30

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

so total students 3x + 7x = 60
                           10x = 60
                              x= 6

no of boys = 7 x 6 = 42
0
girls*
thanks a lot
hope it helps
plz mark as best
why
2014-10-05T14:37:19+05:30
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


0
hey hi and i hope it helps plz mark it as best