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y - wiek brata
dziś:
x=2*y
3 lata temu:
x-3 = 3 * (y-3)
2y - 3 = 3y - 9
-y = -6
y=6
x=2y=2*6=12
b-wiek ani brata teraz
a=2b
a-3=3(b-3)
a-3=3b-9
2b-3=3b-9
-3+9=3b-2b
6=b
a=2b=12
Ania ma 12 lat, a jej brat ma 6