Paco had 26 salty cookies and 17 sweet cookies. He ate 14 sweet cookies and 9 salty cookies. How many salty cookies did Paco have left?
We know that Paco had 26 salty cookies and 17 sweet cookies. He ate 14 sweet cookies, so that means he has 3 sweet cookies left. 

We also know that he ate 9 salty cookies, so that means he has 17 salty cookies left.