Faye was placing w pencils into rows with x pencils in each row. How many rows could she make?
Let's say that Faye has y pencils in total. 

Then, she can make as many rows as she wants, as long as she has at least x pencils in each row. 

That is, she can make y/x rows. 

However, this is not the answer to the question, because the question asks for the maximum number of rows that she can make. 

This means that we need to round down. 

The answer is (y/x) rounded down.