A rogue vampire is attempting to sneak into a mage's tower. He knows that the safest way to get in would be through the back door, where the Wizard has a passageway for his apprentice to make it inside safely. However, the passageway is guarded by a powerful golem made by the Wizard. The rogue scouts the back of the tower to figure out how to deal with the golem. On the first day, the rogue sees the apprentice walk up to the passageway, the golem stops him and speaks: "Twelve" The apprentice responds: "Six" and is let through the passageway. On the second day the golem stops the apprentice again and says: "Six." The apprentice responds: "Three" and is let in. On the third day, the rogue, believing he knows the trick, approaches the golem. The golem stops him and says: "Ten." The rogue proudly says: "Five," and the golem's fist crushes him. What was the correct answer?