Set the price of schoolbag as X, the price of kettle as Y, Xiaojie with A Yuan and Xiaoli with B Yuan. According to the meaning of the question:

A-20+B=Y 1)

b-8+A = X ^ 2)

Y=(2/3)X 3)

Bring 3 into 1), and 1)-2) X=36, then Y=24.

A+B=X+8=44, which is the amount of money they bring.