instruction:
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: 6 birds and 3 storks were sitting on the fence. 2 more storks came to join them. 

 Question: How many more birds than storks are sitting on the fence?
answer:
1


question:
Context: There are 8 different movies and 21 different books in the ' crazy silly school ' series. If you read 7 of the books and watched 4 of the movies 

 Question: How many more movies do you still have to watch?
answer:
4


question:
Context: Paul had 2 books. After selling some in a garage sale he bought 150 new ones. If he has 58 books now 

 Question: How many books did he sell?
answer:

94