[tex]o[/tex] - wiek ojca
[tex]c[/tex] - wiek córki
[tex]o-2=10(c-2)\\o+13=2,5(c+13)\\\\o-2=10c-20\\o+13=2,5c+32,5\\\\o=10c-18\\\underline{o=2,5c+19,5}\\0=7,5c-37,5\\7,5c=37,5\\c=5\\\\o=10\cdot5-18=50-18=32[/tex]
Ojciec ma 32 lata a córka 5.
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[tex]o[/tex] - wiek ojca
[tex]c[/tex] - wiek córki
[tex]o-2=10(c-2)\\o+13=2,5(c+13)\\\\o-2=10c-20\\o+13=2,5c+32,5\\\\o=10c-18\\\underline{o=2,5c+19,5}\\0=7,5c-37,5\\7,5c=37,5\\c=5\\\\o=10\cdot5-18=50-18=32[/tex]
Ojciec ma 32 lata a córka 5.