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.

[EX Q]: 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?
[EX A]: 35

[EX Q]: Context: Debby bought 264 water bottles when they were on sale. If she drank 15 bottles a day for 11 days. 

 Question: How many bottles does she have left?
[EX A]: 99

[EX Q]: Context: In a school there are 34 girls and 841 boys. 

 Question: How many more boys than girls does the school have?
[EX A]:
807