Given the task definition, example input & output, solve the new input case.
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.
Example: Context: Sam is 6 feet tall and Alex is 5 feet tall 

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

New input case for you: Context: Every day Ryan spends 7 hours on learning english and some more hours on learning chinese. If he spends 2 hours more on learning english than on learning chinese 

 Question: How many hours does he spend on learning chinese?
Output:
5