here's a few of my favorites-
I have 2 standard issue US coins, their combined face value is $.55, however, one of them is not a nickle. what are they?
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lets go back to the time before CD's- how many more grooves are there on a 33 1/3-rpm album, than a 45-rpm single?
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an electrician is left alone to finish up the last of a wiring job. he's almost done, but faced with a problem.
on the first floor of the building (which is also where he currently is), there are 3 switches labeled A,B, & C. these switches operate 3 lights on the second floor. his task is to put the labels on the lights that correspond with the switch that operates them.
here's the problem- the wiring is all covered so he can't trace the wires, and his boss has taken the wiring plans with him. all he has to go on is checking to see which switch operates which light.
to further complicate things- there are no windows or other means to tell which lights are on while he is on the first floor. also he's been left with no keys and the doors (from outside to 1st floor, between first and second floor, and second floor to outside stairs)all lock as he goes through them. so he can't come back to the 1st floor.
he has nothing to prop doors open with and there is a door at the top and bottom of the stairs. so once he can see which lights are on, he can no longer go back and reposition the switches.
so here's the question- how can he position the switches on the first floor so that he'll know for certain which light goes with which switch, all in one try?
