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This is an old one, but it's still good:

You have three light fixtures in a room and three switches in another room. You are standing in the room with the switches and from here you cannot see the fixtures. You can only leave the room once. How do you figure out which switch operates which fixture?

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Posted · Report post

Already posted at least once...

Turn one on for a while, then turn it off and turn on a different switch. Walk into the room. One is hot, one's on and one's off.

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Posted (edited) · Report post

stand in the doorway not out of the room.

Edited by kiger
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Posted · Report post

already posted ... check puzzle entitle Bulbs ... btw, it is the very first puzzle on my site with 242 responses in the forum

there are a few variations on this one (and posted in this forum as well) - 4, 5 and 100 bulbs

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