# 30 girls and boys have planned for a picnic. There is a ratio of 3 girls to 7 boys. How many boys are there?

2
by joshua13

2016-03-17T23:57:10+05:30

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Given ratio of girls and boys =3:7
let the number of girls be 3x and boys be 7x
we know that the total number of boys and girls is 30
thus,
3x+7x=30
10x=30
x=30/10
x=3
therefore ,the number of boys =7x=7(3)=21
2016-03-18T00:31:48+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let The Common Multiple be x
So ratio of girls to boys = 3x : 7x

Total no . of Children = 30

According To The given Statement

3x + 7x = 30
10x = 30
x = 3

So,
No . of Girls = 3x = 3 * 3 = 9
No . of Boys = 7x = 7 * 3 = 21

﻿Answer = No . Of Boys = 21

Check -
→No . of Boys + No . of Girls = 30
9 + 21 = 30
→Ratio of Girls to the Boys = 3/7
9/21 Dividing by 3 = 3/7

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