Xiao Li collected some stamps. She took out half of them and gave them to Xiao Jun. she had 45 left. How many stamps did Xiao Li have?
x-(x/2-1)=45
Xiaomei and Xiaoli are both stamp collectors. Xiaoli has 90 more stamps than Xiaomei and 2 / 5 less stamps than Xiaoli
Xiaoli = 90 △ 2 / 5 = 225 sheets
Xiaomei = 225-90 = 135
Xiaoli has 90 more stamps than Xiaomei and two fifths less stamps than Xiaoli. How many stamps do Xiaomei and Xiaoli have?
Let Xiao Li and Xiao Mei have X and Y sheets
Equations: x + y = 90,0.4x = 90
X=225,Y=135