To put this into simpler terms, well simplier for me anyways, Emma is dividing 9 inches of paper into 2/5, or .4, inches of paper.
That being said, we now just need to divide 9 by 2/5 or .4
We get 22.5
So Emma will be able to make 22 strips since we can't have half a strip. (Well, we could, but it would be small than what we need)
Any questions?