The ratio is 2:3 that is a total of 5 people
We now need to see how much groups of 5 we need to get to 40
5 × 8 = 40
So we have 8 groups of 5 that would make 40 students'
8 groups of 2:3 ⇒ 8 × (2:3)
⇅
(8 × 2) (8 × 3) = 16:24
There are 16 boys and 24 girls.
Then when you subtract 24 - 16, you would get 8.
There are 8 more girls than boys in the art club.
