The Venn diagram in Fig. 10 classifies the 100 books in a family's library as hardback (H ), fiction (F), and children's (C). Exercises 1-10 refer to this Venn diagram.

1. How many books are hardback fiction?
2. How many books are paperback fiction?
3. How many books are fiction?
4. How many books are nonfiction?
5. How many books are paperback nonfiction children's books?
6. How many books are adult hardback nonfiction?
7. How many books are either hardback or fiction?
8. How many hardback books are either fiction or children's books?
9. How many children's books are either hardback or fiction?
10. How many books are either hardback, fiction, or children's books?

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