Xiaoli's stamp is 4 or 5 times of Xiaoqiang's. If Xiaoli gives Xiaoqiang 20 stamps, Xiaoli's stamp is 2 times less than Xiaoqiang's. how many stamps do you have Fang Chengjie

Xiaoli's stamp is 4 or 5 times of Xiaoqiang's. If Xiaoli gives Xiaoqiang 20 stamps, Xiaoli's stamp is 2 times less than Xiaoqiang's. how many stamps do you have Fang Chengjie

Set X for Xiaoqiang and 4.5X for Xiaoli
4.5X-20=2(X+20)-10
4.5X-20=2X+30
2.5X=50
X=20
Xiaoqiang = 20
Xiaoli = 20 * 4.5 = 90 sheets