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: 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?
answer:
8


question:
Context: A waiter had 3 customers. After some left he still had 4 customers. 

 Question: How many more customers stayed behind than those that left?
answer:
5


question:
Context: The Razorback t-shirt shop makes $ 106 dollars off each t-shirt sold. During the Arkansas game and the Texas tech game they sold a total of 242 t-shirts. If they sold 115 t-shirts during the Arkansas game 

 Question: How many t-shirts did they sell during the Texas tech game?
answer:

127


