Question

There are 120 girls and 102 boys in 6th grade at Travis Intermediate. If 17 boys are in the first PE class, how many girls are likely in that class?

A
120 girls

B
22 girls

C
17 girls

D
20 girls

Answer 1

Number of girls in PE class is 20

D. 20 girls

Explanation:

We are given

Number of girls in 6th grade =120

Number of boys in 6th grade =102

so, firstly we will find ratios of girls and boys

`(G)/(B)=(120)/(102)`

now, we have

17 boys are in the first PE class

Let's assume number girls in PE class as 'x'

we know that

ratios of boys and girls must be equal

so, we get

`(G)/(B)=(120)/(102)=(x)/(17)`

now, we can solve for x

`(120)/(102)=(x)/(17)`

`x=17* (120)/(102)`

`x=20`

So,

Number of girls in PE class is 20