Answers

2016-04-24T16:39:48+05:30
Let,
the no.of girls = 30
      no.of boys = 7x
3x = 30
 x = 30/3
x = 10
no.of boys = 7x = 7 × 10 =70
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2016-04-24T16:41:47+05:30
Ratio of girls to boys= 3:7
boys=7x
girls=3x
total=10x
10x=30
x=3

girls=3*3 =9
boys=7*3=21
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