Eric bought apples and oranges for $7.75. He paid $2.35 for all the apples and $0.45 for each orange. How many oranges did he buy?
+36916 apples cost 2.35
oranges cost .45 x where x is the number of oranges
2.35 + .45 x = 7.75 solve for x the number of oranges..... 
