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

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