Lois has 40 books. She gives a fourth of her books to her nephew. From her remaining books, she donates a third of her books to the library. Then she purchases 3 new books from the book store. How many books does Lois have now? Give me reasons, before answering the question
Lois gives 40 / 4 = 10 books to her nephew. Then Lois has 40 - 10 = 30 books. Lois donates 30 / 3 = 10 books to the library. Then Lois has 30 - 10 = 20 books. After purchasing new books, Lois has 20 + 3 = 23 books. So the final answer is 23.