Bobby wanted pancakes for breakfast.  The recipe on the box makes 21 pancakes.  While he ate 5 pancakes, his dog jumped up and was able to eat 7 before being caught.  How many pancakes does Bobby have left?
Bobby ate 5 pancakes and his dog ate 7 so 5+7 = <<5+7=12>>12
The recipe makes 21 pancakes and 12 were eaten so 21-12 = <<21-12=9>>9 pancakes were left
#### 9