Question

It costs $4 to enter the fair. Each ride costs $2.50. You have $21.50. How many rides can you go on?

Answer 1

Since it costs $4, you will have $17.50 left to go on rides. $17.50 divided by $2.50 is 7. So you can go on 7 rides.

Answer 2

You can get on 7 rides. 

Math:
21.50 - 4.00 = 17.5 / 2.50