Use reasoning to answer the following question.
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?

23
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 answer is 23