Úloha ID 498 - 
Myslím si číslo x, když k němu přičtu y, tak dostanu číslo z. Čemu se rovná součet x,y a z?
Správná odpověď je: B
Zadání lze přepsat na rovnice jako: x + y = z; x + y + z = ?, tedy x + y + z = 2z. Dostačující je tak pouze tvrzení (2).
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Otázka zní: “Čemu se rovná součet x,y a z?”
Použijeme druhé tvrzení. Tedy z = 5
Pokud x+y = 5 = z pak tedy:
x+y+z=z+z=5+5=10
Odpověď tedy zní: “Součet x,y a z je 10.”
Na řešení kolik je x a y se otázka neptá. Proto je druhé tvrzení dostačující.
Správná odpověď by tedy měla být B)