X - wiek Jacka
20%*x = 1/5 x - wiek Asi
X+1/5x =30
6/5x=30
X=25
1/5x=5
x - wiek Jacka
20%x=0,2x - wiek Asi
x+0,2x=30
1,2x=30 |:1,2
x=300/12
x=25
Jacek ma 25 lat.
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X - wiek Jacka
20%*x = 1/5 x - wiek Asi
X+1/5x =30
6/5x=30
X=25
1/5x=5
x - wiek Jacka
20%x=0,2x - wiek Asi
x+0,2x=30
1,2x=30 |:1,2
x=300/12
x=25
Jacek ma 25 lat.