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.
One example: Context: Sam is 6 feet tall and Alex is 5 feet tall 

 Question: By how many feet is Sam taller than Alex? 
Solution is here: 1
Explanation:  Sam's height - Alex's height = 6-5 = 1

Now, solve this: Context: Tiffany was collecting cans for recycling. On monday she had 8 bags of cans. The next day she found 7 more bags worth of cans. 

 Question: How many more bags did she have on monday than she found on the next day?
Solution:
1