Solution: For example, there are X books for science and technology and 4x-30 books for literature and art..

4x-30-x= 1200

3x= 1230

x=4 10

4x-30 = 4x410-30 =1640-30 =1610 copies.

A: Science and technology books 4 10, literature and art books 1 6 10.