Úloha ID 1429 - 
X je kladné dvouciferné číslo, jehož ciferný součet je roven 15. Rozdíl tohoto čísla X a čísla, které vznikne výměnou pozic jeho cifer, je kladné jednociferné číslo. Urči číslo X · 1/3 + 2.
Správná odpověď je: B
Možnosti pro X jsou tyto: 78, 87, 69 a 96. Rozdíl jedné z těchto dvojic má být jednociferné číslo, což splňuje dvojice 78 a 87. Aby byl rozdíl kladný, tak X musí být větší než číslo s přehozenými ciframi. X tedy musí být 87. Výsledek je potom X · 1/3 + 2 = 29 + 2 = 31.
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