Final answer:
There are 160 non-fiction books for sale in the bookstore.
Step-by-step explanation:
In this question, we are given that the ratio of non-fiction books to the total number of books for sale is the same. Let's denote the number of non-fiction books as 'x'. Since the ratio is the same, the number of fiction books must also be 'x'. We are also given that there are 320 different books in total.
Using this information, we can set up the following equation: x + x = 320. Simplifying, we get 2x = 320. Dividing both sides by 2, we find that x = 160.
Therefore, there are 160 non-fiction books for sale in the bookstore.