Xiaoli has 14 more stamps than Xiaolan, which is exactly two-thirds of Xiaolan's. how many stamps does Xiaoli have

Xiaoli has 14 more stamps than Xiaolan, which is exactly two-thirds of Xiaolan's. how many stamps does Xiaoli have

Let Xiao Li have X stamps and Xiao Lan have y stamps
According to the condition of the title, we get the conclusion
x-y=14
14=(2/3) y
Solution
y=21
x=35
Xiaoli has 35 stamps

Xiaolan has 12 more stamps than Xiaoli. These stamps are just 4 / 7 of Xiaolan's stamps. How many stamps does Xiaolan have?

Let Xiaolan have X sheets, X-12 equals 4 / 7X 7 / 4x-21 equals x 7 / 4x equals x + 21, 3 / 4x equals 21, x equals 28

Xiaoli has 15 more stamps than Xiaolan, which is just 7 / 10 of Xiaolan's stamps. How many stamps does Xiaoli have

Let Xiaolan have X stamps
15 in x = 3 in 10
X = 50 (this is the number of stamps of Xiaolan)
15 + 50 = 65 (sheet)
A: Xiao Li has 65 stamps

Xiao Li and her father practice walking race. Her father walks 50 meters more every minute than Xiao Li. When her father walks 1800 meters, Xiao Li just walks 1200 meters. She asks Xiao Li if she walks every minute
It's a linear fractional equation of one variable,

She walks x meters per minute
1800/（50+x）=1200/x
1800x=1200（x+50）
1800x=1200x+60000
600x=60000
x=100
A: Xiaoli walks 100 meters per minute