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y-wiek taty
x+y=45
x=y-25
y-25+y=45
2y=70 /:2
y=35
Odp.Tata bartka ma 35 lat, natomiast Bartek ma 10.
y=x+25
2x=20
x=10
y=10+25=35
Tata ma 35 lat a syn 10
x-1=2y
x=y+5
y+5-1=2y
x=y+5
4=y
y=4
x=9
Agniesz ka ma 4 lata a Basia 9.