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x - wiek siostry
x-4 - wiek bartka
za sześć lat :
x+6 - wiek siostry
x-4+6 - wiek bartka
x+6 + x-4+6 = 34
2x +8 = 34
2x = 34-8
2x = 26
x = 13
Siostra ma 13 lat, a Bartek 9. Proszę o naj :).
x-wiek Bartka
y-wiek jego siostry
y=x+4
6+x+6+y=34
y=x+4
12+x+x+4=34
y=x+4
2x=18
y=x+4
x=9
y=13
x=9
13-9=4
13+6+9+6=34
Odp. Bartek ma 9 lat, siostra 13