A man went on a trip with a fox, a goose and a sack of corn. He came upon a stream which he had to cross and found a tiny boat to use to cross the stream. He could only take himself and one other – the fox, the goose, or the corn – one at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How does he get all safely over the stream?
Answer: Take the goose over first and come back. Then take the fox over and bring the goose back. Now take the corn over and come back alone to get the goose. Take the goose over and the job is done!
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You are standing in front of a room with one lightbulb inside of it. You cannot see if it is on or off. Outside the room, there are 3 switches in the off positions. You may turn the switches any way you want to. You stop turning the switches, enter the room and know which switch controls the lightbulb. How?
Answer: You turn 2 switches "on" and leave 1 switch "off" and wait about a minute. Then enter the room, but just before you enter, turn one switch from "on" to "off". Once in the room, feel the lightbulb - if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on. If it is cold and is off, it has to be the switch you left in the off position.
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You turn 2 switches “on” and leave 1 switch “off” and wait about a minute. Then enter the room, but just before you enter, turn one switch from “on” to “off”. Once in the room, feel the lightbulb – if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on. If it is cold and is off, it has to be the switch you left in the off position.
Show Answer
You turn 2 switches “on” and leave 1 switch “off” and wait about a minute. Then enter the room, but just before you enter, turn one switch from “on” to “off”. Once in the room, feel the lightbulb – if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on. If it is cold and is off, it has to be the switch you left in the off position.
