Question 172858
If the camera costs $250 and you have $115, you figure out how much more you need to earn by subtracting 115 from 250.  250-115 = 135.  


So, you need to earn $135. If you earn $9 per hour, you figure out how many hours it will take to earn the money by dividing 135 by 9 to see how many hours you need.   135/9 = 15.

You need to work 15 hours at $9 per hour to earn the $135 you need.