Paco had 41 cookies. He gave 9 cookies to his friend and ate 18 cookies. How many more cookies did he eat than those he gave to his friend?

We know that he started with 10 cookies and ended with 3. That means that he ate 7 cookies. 

If we start with the premise that he gave away some cookies to his friend, we also know that his friend would have ended up with more cookies than he started with. 

That means that the difference between the number of cookies his friend had at the end, and the number of cookies his friend had at the beginning, would be less than the difference between the number of cookies he had at the end, and the number of cookies he had at the beginning. 

The difference between the number of cookies he had at the end, and the number of cookies he had at the beginning, is 7. So, the difference between the number of cookies his friend had at the end, and the number of cookies his friend had at the beginning, must be less than 7. 

We also know that his friend started with 2 cookies. 

That means that the number of cookies his friend had at the end must be greater than 2. 

The only way for the difference between the number of cookies his friend had at the end, and the number of cookies his friend had at the beginning, to be