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.

Context: Helen the hippo and her friends are preparing for thanksgiving at Helen's house. Helen baked 19 chocolate chip cookies yesterday and 231 raisin cookies and 237 chocolate chip cookies this morning. 

 Question: How many more chocolate chip cookies than raisin cakes did Helen bake?
25

Context: Paul got a box of 521 crayons and 66 erasers for his birthday. At the end of the school year he only had 154 left while not having lost a single erasers. 

 Question: How many crayons had been lost or given away?
367

Context: David did 44 push-ups in gym class today. David did 9 more push-ups than Zachary. 

 Question: How many push-ups did Zachary do?

35