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Potrebujem pomôcť rýchlo s tomto príkladom,
Otec a syn sú stolári, rozhodli sa vyrobiť jednoduchý šatník. Otcovi by práca na ňom trvala 10 hodín, synovi 15 hodín. Za koľko hodín vyrobia šatník, ak budú pracovať spolu?
Otec a syn sú stolári, rozhodli sa vyrobiť jednoduchý šatník. Otcovi by práca na ňom trvala 10 hodín, synovi 15 hodín. Za koľko hodín vyrobia šatník, ak budú pracovať spolu?
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