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y-wiek marka
2x=y
x+5=y
2x=x+5
x+5=y
2x-x=5
x+5=y
x=5
5+5=y
x=5
y=10
Odp:Jacek ma 5 lat, a Marek 10
m - obecny wiek marka
2j = m
j + 5 = m
2j = j + 5
j = 5
m = 10
Jacek ma teraz 5 lat, a Marek - 10.