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.

Context: There were 8 people on the bus. At the next stop 12 more people got on the bus and 3 people got off.

Question: How many people are there on the bus now?
17

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?
5

Context: Baker made 7 cakes and 148 pastries. If he sold 15 cakes and 103 pastries

Question: How many pastries would baker still have?
45