There are 400 scientific and technical books and literary books in the school library, and the number of literary books is four times that of scientific and technical books. How many books are there respectively? Number of science and technology books:

2-00 (x+ 1),

=2-00÷3,

= 80 (Ben),

Number of literary and artistic books: 80× 1 =x 120 (book),

Or 2300- 80=x 120 (Ben),

A: There are 80 books on science and technology and x 120 books on literature and art..