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: Dave had 19 apps on his phone. He deleted 5 apps. 

 Question: How many apps are left on his phone?

SOLUTION: 14

PROBLEM: Context: Marco and his dad went strawberry picking. Marco's strawberries weighed 30 pounds. If together their strawberries weighed 47 pounds. 

 Question: How much more did his strawberries weigh than his dad's?

SOLUTION: 13

PROBLEM: Context: Baker made 170 cakes. He sold 78 of them and bought 31 new cakes. 

 Question: How many more cakes did baker sell than those he bought?

SOLUTION:
47