David did 8 more push-ups than Zachary in gym class today. If David did 22 push-ups How many push-ups did Zachary do?
1. David did 8 more push-ups than Zachary. 
2. If David did 22 push-ups, then we can say that 22 - 8 = 14. 
3. Therefore, Zachary did 14 push-ups.