Zachary did 46 push-ups and 58 crunches in gym class today. David did 38 more push-ups but 62 less crunches than zachary. How many more crunches than push-ups did Zachary do?
Zachary did 46 push-ups and 58 crunches. 
David did 38 more push-ups than Zachary, so he did 84 push-ups. 
David did 62 less crunches than Zachary, so he did 96 crunches. 

Zachary did 12 more crunches than David.