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y - Weronika
x=2y
(x+5)+(y+5)=40
x=2y
x+5+y+5=40
x=2y
x+y=30
2y+y=30
3y=30
y=10
x=2*10
x=20
Odp: Weronika ma obecnie 10 lat , a Mateusz 20 lat
x weronika
za 5 lat czyli
2x+5+x+5=40
2x+x=40-5-5
3x=30/3
x=10
Weronika ma teraz 10 lat mateusz 20 a za 5 at wernoika 15 Mateusz 25