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: Edward had $ 18. He spent $ 16. 

 Question: How much money does Edward have now?
2

Context: 15 campers went rowing in the morning. Some more campers went rowing in the afternoon. If a total of 32 campers went rowing that day 

 Question: How many campers went rowing in the afternoon?
17

Context: 43 children were riding on the bus. At the bus stop some children got off the bus. Then there were 21 children left on the bus. 

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

22