Let B have X books, A has x+ 18 books, and C has 4x÷5 books. Make an equation according to the meaning of the question.

x+x+ 18+4x÷5= 180

2x+ 18+4x÷5= 180

2x+4x÷5= 180- 18

2x+4x÷5= 162

10x+4x=8 10

14x=8 10

X=57 copies

A: 57+ 18=72 copies.

C has 4x÷5=57×4÷5.

=228÷5

=459