DANE:
Zosia - xtata - 3x3x=x+303x-x=302x=30/:2x=15 - wiek Zositata - 3·15=45 lub 15+30=45 to wiek taty
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DANE:
Zosia - x
tata - 3x
3x=x+30
3x-x=30
2x=30/:2
x=15 - wiek Zosi
tata - 3·15=45 lub 15+30=45 to wiek taty