Zachary did 2 push-ups in gym class today. David did 41 more push-ups than Zachary. John did 24 push-ups less than david. How many push-ups did David do?
Zachary did 2 push-ups. 
David did 41 more push-ups than Zachary. 
John did 24 push-ups less than David. 

This means that David did 43 push-ups.