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.
--------
Question: 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?

Answer: 45


Question: Context: Tiffany was collecting cans for recycling. On monday she had some bags of cans. The next day she found 4 more bags worth of cans. If she had a total of 8 bags altogether 

 Question: How many bags did she have on monday?

Answer: 4


Question: Context: 22 children were riding on the bus. At the bus stop 40 children got on the bus while some got off the bus. Then there were 2 children altogether on the bus. 

 Question: How many children got off the bus at the bus stop?

Answer:
60