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b-wiek Bartka
a+b=45
a-25=b
a+a-25=45
2a-25=45/+25
2a=70/:2
a=35
35+b=45/-35
b=10
Odp.: Tata ma 35 lat a Bartek 10 lat
a-wiek agnieszki
b - wiek Basi
2(a-1)=b-1
b-5=a
2a-2=b-1/+2
b-5=a
2a=b+1
b-5=a
2(b-5)=b+1
2b-10=b+1/-b
b-10=1/+10
b=11
11-5=a
6=a
11=b
Odp.: Basia ma 11 lat a agnieszka ma 6 lat