The Light Bulb

[cafemia]

You are in a house. There are 3 light switches. Inside of a closed room (that you CAN NOT see) there is a light bulb that is turned on by one of the switches. If you can only go inside the room one time, how can you tell which switch turns on the light?

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The Answer:

You turn the first switch on for ten minutes. Then you turn that one off, and turn on the second one, then go inside the room. If the light is off but the bulb is HOT, it's the first switch. If the light is on, it's the second switch. And if the light is off and the bulb is cold it's the third switch.

[Amaryllis]

This posting was the top of the milk , today. Thanks for your witty quiz. My chord in my brain became taut I think. You know a smile flickered in my face.

[David36]

Ordinary guys like me gotta go in at least 2 times to find the answer. The smart guy who worked it out must be the one habituated to usual thinking, while the kinds like me have no capasity to tell clearly every morning which toothbrush is mine.