When you sign up for a gaming website, you get two months free. then you are charged $18 per month. if you pay $90, how many months will you be able to play?

To solve this problem, you simply need to divide 90 by 18, to find the number of paid months, then add the two free months. 

So: 

= 5 paid months

5 paid months + 2 free months = 7 months that you will be able to play

Hope this helped :)