Jo earned $4378 by selling doughnuts for two dollars each.If she sold 978 chocolate doughnuts and all the other doughnuts she sold were plain how many plain doughnuts did she sell?
Your first equation is: 4378=2x x=doughnuts c=chocolate p=plain Then you solve for x: x=2189 Then make a new equation. 2189=c+p You know c=978 so you replace it for c. 2189=978+p Then subtract 978 from both sides p=1211 Then check: 4378=2(978)+2(1211) 4378=1956+2422 4378=4378 Jo sold 1,211 plain doughnuts.
