Modelová Otázka ID 1917 - 
Aritmetický průměr tří čísel je 182. Každé číslo je o 20 % větší než číslo předcházející. Které z těchto čísel je nejmenší?
Správná odpověď je: C
Pokud označíme nejmenší číslo x, prostřední y a největší z, pak zadání lze zapsat jako soustavu rovnic, kde 182 = (x + y + z)/3; y = x + 0,2x; z = y + 0,2y.
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