There are three kinds of books in the library, science and technology books account for 13, and the ratio of literature and art books to other two books is 1: 5. Literature and art books are less than science and technology books 180. How many science and technology books are there? The ratio of literature and art books to the other two books is 1: 5, so the literature and art books are:

1÷( 1+5)= 1÷6= 16;

180÷( 13? 16)

= 180÷ 16,

= 1080 (Ben);

1080× 13=360 (Ben);

A: There are 360 science and technology books.