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: A grocery store had 19 bottles of diet soda and 60 bottles of regular soda. 

 Question: How many more bottles of regular soda than diet soda did they have?

Answer: 41


Question: Context: Dave had 19 apps and 18 files on his phone. After deleting some apps and files he had 6 apps and 15 files left. 

 Question: How many more files than apps does he have left on the phone?

Answer: 9


Question: Context: Paul had 51 books and 106 pens. After selling some books and pens in a garage sale he had 82 books and 14 pens left. 

 Question: How many pens did he sell in the garage sale?

Answer:
92