Úloha ID 1414 - 
Syn má v roce 2005 jednu třetinu věku svého otce. V jakém roce bude mít syn poloviční věk svého otec?
Správná odpověď je: E
Získáme soustavu rovnic 3x = y a 2 · (x + A) = y + A, kde x je věk syna a y věk otce. Tato soustava říká, za kolik let se požadovaná změna stane. Po úpravě vyjde A = x, tedy když bude mít syn v roce 2005 x let, tak za x let bude jeho otec vždy dvakrát starší a dojde ke splnění podmínky ze zadání.
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Vysvětlení v řešení chápu, ale pokud bychom řešili úlohu vylučovací metodou a řídili se výsledky, tak by jediný možný rok byl 2013.. tedy pokud bychom se řídili a brali v potaz opravdové možné nejnižší věky, ve kterých se otec ,,mohl stát otcem” 😀 to by bylo 16 let, takže potom třetina věku otce by byla 8 a otec by měl 24. Za 8 let by synovi bylo 16 a otci by bylo 32, což už je polovina toho věku otce.. nebo mi tu něco uniká? Předem díky za vysvětlení