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: Tiffany was collecting cans for recycling. On monday she had 7 bags of cans. The next day she found 12 more bags worth of cans. 

 Question: How many more bags did she find on the next day than she had on monday?
5

Context: Paul got a box of 253 crayons for his birthday. By the end of the school year he had either lost or given away 70 of them. 

 Question: How many crayons did he have left by the end of the school year?
183

Context: Paul got a box of 440 crayons for his birthday. During the school year he gave 111 crayons to his friends while he lost 106 crayons. 

 Question: How many crayons did he have left?

223