At a used-book sale, 100 books are adult books and 160 are childrens books. Of the adult

Question:

At a used-book sale, 100 books are adult books and 160 are children’s books. Of the adult books, 70 are nonfiction while 60 of the children’s books are nonfiction. If a book is selected at random, find the probability that it is
a. Fiction
b. Not a children’s nonfiction book
c. An adult book or a children’s nonfiction book