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: Jack received 10 emails in the morning, 5 emails in the afternoon and 4 emails in the evening. 

 Question: How many more emails did Jack receive in the afternoon than in the evening?
1

Context: Kelly has 80 nintendo games. She found 31 more nintendo games. 

 Question: How many does she need to give away so that she will have 6 games left?
105

Context: Paco had 40 sweet cookies and 25 salty cookies. He ate 28 salty cookies and 15 sweet cookies. 

 Question: How many more salty cookies than sweet cookies did he eat?

13