Which Light
Published: Nov 30, 1999
Riddle: You're on the first floor of a house and you have no view of the second story of the house. There are three light switches on the first floor that turn on three lights on the second floor. You can only have one switch on at a time and you can only go upstairs once. How do you find out which switch goes to which light.
Answer: Turn one switch on for 10 minutes then turn it off. Turn on the second switch then go upstairs. The light that is on is the second switch the light that is still hot is the first and the light that isn't either is the third switch.
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