Rhianna and Myra, both teachers, are adding books to their class libraries. Rhianna's classroom started out with a collection of
only 11 books, but she plans to purchase an additional 2 books per week. Myra's library started out with 6 books, and she has enough money in her budget to purchase another 3 books per week. At some point, the two teachers' libraries will contain the same number of books. How many books will each class have? How many weeks will that take?
