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o-wiek ojca
Obliczenia:
s+o =60
s-5+o-5=50
s-5+4(s-5)=50
s-5+4s - 20=50
5s=75 /5
s=15
o=60-15=45
Po 2 latach:
s=15+2=17
o=45+2=47
Odpowiedz: Po 2 latach syn będzie miał 17 lat a ojciec 47.