TASK DEFINITION: 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.
PROBLEM: Context: After finding some bottle caps at the park danny has 32 bottle caps in his collection. If he had 25 bottle caps in his collection earlier 

 Question: How many bottle caps did he find at the park?

SOLUTION: 7

PROBLEM: Context: Edward spent $ 16 to buy books and $ 8 to buy pens. Now he has $ 19. 

 Question: How much more did Edward spend on books than pens?

SOLUTION: 8

PROBLEM: Context: After a typhoon, 13 trees in Haley's backyard died. If she had grown 3 trees initially 

 Question: How many more trees died in the typhoon than those that survived?

SOLUTION:
23