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: Some children were riding on the bus. At the bus stop 2 more children got on the bus. Then there were 41 children altogether on the bus. 

 Question: How many children were riding on the bus before the bus stop?

SOLUTION: 39

PROBLEM: Context: Paco had 40 sweet cookies and 25 salty cookies. He ate 28 salty cookies and 15 sweet cookies. 

 Question: How many more salty cookies than sweet cookies did he eat?

SOLUTION: 13

PROBLEM: Context: Paco had 39 sweet cookies and 6 salty cookies. He ate 23 salty cookies and 32 sweet cookies. 

 Question: How many more sweet cookies than salty cookies did he eat?

SOLUTION:
9