Question

Plz answer this the one i circled

Answer 1

We can setup an equation for this.

Boys to Girls = 2:7

Boys = x

Girls = 250+x

Setup the ratio

x:(250+x) = 2:7

x / (250+x) = 2/7

7x = 500+2x

7x-2x = 500

x = 500/5 =100

There are 100 boys at the concert

Hope this helps:)