Sign/Countersign
Okay, so this isn't the best nor the trickiest riddle ever, but it made me so sad to see the Road to Fair Day section so dead that I had to do *something*. So here you go!
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Two spies have an order to infiltrate an enemy military base. Unfortunately for them, a guard is posted at the gate. The guard requires a countersign before he allows any to enter, so the spies hide near the gate to see if they can determine the day's signs.
An enemy soldier approaches, and the spies can hear the guard give the sign, "6". The soldier seeking entrance gives a countersign of "3", and the guard lets him pass. Another soldier comes, to whom the guard says, "12". The soldier gives the answer, "6", and the guard lets him pass. Certain that he has figured out the simple pattern, the first spy approaches the gate and the guard says, "10". The spy quickly replies with, "5". Immediately, the guard shoots him dead.
The second spy, realizing what the true pattern to the day's sign/countersign is, walks to the gate. The guard says "8". The spy gives the correct answer, and the guard lets him in.
What was the answer that the spy gave?
