You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[Q]: Context: David did 40 more push-ups but 17 less crunches than Zachary in gym class today. If Zachary did 34 push-ups and 62 crunches 

 Question: How many crunches did David do?
[A]: 45


[Q]: Context: There were 78 dollars in Olivia's wallet. She spent 15 dollars at a supermarket. 

 Question: How much money does she have left?
[A]: 63


[Q]: Context: A chef had 58 apples. After making some pies, he had used 35. 

 Question: How many apples remained?
[A]:
23