( 13X-2):(7X+2)=3:2

The solution is X=2.

So 13X=26, 7X= 14.

A: It turns out that the Chinese and math teachers are 26 14 respectively.

20/( 1-3/4)=80, which is the original library of A.

80 times 1/4=20, which is the original library of B.

Now the library of A is: 20, and the library of B is: 20+(80-20)=80.

So now the ratio of books in A and B collections is 20: 80 = 1: 4.