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2.6 lat
x-moj wiek
y-wiek corki
x=7y
x+20=(y+20)x2
x=7y
7y+20=2y+40 => 5y=20 => y=4
x=7x4=28
Odp.:Mam 28 lat, moja corka ma 4 lata
Zad 2
x-wiek grzesia
x+3=3(x-3)
x+3=3x-9
-2x=-12
x=6
Odp:Grzes ma 6 lat