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: 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?
[EX A]: 17

[EX Q]: Context: 28 children were riding on the bus. At the bus stop 82 children got on the bus while some got off the bus. Then there were 30 children altogether on the bus. 

 Question: How many more children got on the bus than those that got off?
[EX A]: 2

[EX Q]: Context: You have read 8 books from the ' crazy silly school ' series. If there are a total of 14 different books in the ' crazy silly school ' series 

 Question: How many more do you still have to read?
[EX A]:
6