Brain Teasers & Puzzles
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You are in a room with three light switches, each of which controls one of three light bulbs in the next room. Your task is to determine which switch controls which bulb. All lights are initially off, and you can’t see into one room from the other. You are allowed only one chance to enter the room with the light bulbs. How can you determine which light switch goes with which light bulb?
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draw a square. divide it into four identical squares. remove the bottom left hand square. now divide the resulting shape into four identical shapes.
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Farmer John has a chicken farm. On a certain day, John calculates in how many days he will run out of chicken-food. He notices that if he would sell 75 of his chickens, he could feed the remaining chickens twenty days longer with the chicken-food he has, and that if he would buy 100 extra chickens, he would run out of chicken-food fifteen days earlier.
How many chickens does farmer John have?
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you die and the devil says he’ll let you go to heaven if you beat him in a game. the devil sits you down at a round table. he gives himself and you a huge pile of quarters. he says “ok, we’ll take turns putting quarters down, no overlapping allowed, and the quarters must rest on the table surface. the first guy who can’t put a quarter down loses.” you guys are about to start playing, and the devil says that he’ll go first. however, at this point you immediately interject, and ask if you can go first instead. you make this interjection because you are very smart, and you know that if you go first, you can guarantee victory. explain how you can guarantee victory.
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