How to use 5x+6=66 in a real - world problem

John bought 5 apples and Frank bought 12 times as much apples and Garrett bought 6 apples. How many apples do they have all together? The answer is 66

A real-world problem means that it can be applied to anyone's daily life. So, this could be a possible problem for 5x + 6 = 66.

Aaron bought 5 books from a bookstore and his total was $66 including the walk-in charge of $6. What did each book cost?

- This is where x = cost of books.