Set the unit price of literature and art books x the unit price of science and technology books 2X+2.

18X+ 10(2X+2)=468.4

38X=468.4-20

38X=448.4

X= 1 1.8

2X+2=25.6

Second, let the little monk x the big monk100-X.

( 100-X)*3+X/3= 100

(8/3)X=200

X=200*3/8

x=75

100-x=25