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y-wiek bartka
x+y=45
x-y=25
______
2x=70 /:2
x=35
35+y=45
y=10
Tata ma 35 lat, a Bartek 10
20/2=10
Odp: Bartka ma 10 a jego tata 35.
45-25=30 - wiek taty
45-30=15 -wiek bartka