domenica 10 maggio 2009

Exercise #3

A spy try to enter in a secret US Navy base. Hidden, he see that to people wishing to enter the sentinel asks something, then people answers a correct "password" and enter. The spy couldn't understand, so, very cautiously, try to approach and finally he  is quite nearby...
He see and hears that:

To first person wishing to enter, the sentinel asks "twelve?" and the quick answer is: "six !!"
"Pass!!" says the sentinel.
To second person wishing to enter, the sentinel asks:"six?" and the quick answer is "three!!"
"Pass!" says the sentinel.

At this point the spy has all clear: it is sufficient to answer dividing by two the number said by the sentinel.

So the Spy come quick to the entrance, and the sentinel asks him: "ten ??" and the Spy "five!!"
He is immediately arrested and immobilized with throttles. Now he is in danger of death...

Now, my fantastic readers, can you tell me which was the real link between question and answer ??

Enjoy !!

Claudio

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