Interview Puzzle
I went on an interview last night and was asked a planning / think on your feet question. I did not get it right there but was thinking about it all evening. Upset I could not figure it out I set off to bed – turned off the light and finally knew the answer. For those who might want to think about it and did not already hear it, here is the question.
You have one light bulb wired to three switches. The bulb is under a box so you cannot see it or the light it produces. You can move the switches anyway you want but you can only open the box once. At that point you should know what switch controls the light. How do you know? I’ll answer in a comment.
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Answer: Turn on switch number 1 for a few minutes (let it warm up). Turn it off.
Move switch number 2 on and switch number 3 off. Open the box.
If the light is on you know it is switch 2.
If the light is off and cold you know it is switch number 3.
If the light is off and warm you know it is switch number 1.
How easy is that!? And I didn’t get it! Ugh.