Logic puzzles are fun!

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briteshadow
briteshadow Posts: 87
in Chit-Chat
You're in a dark room with 100 coins on a table, 12 are heads and the rest are tails, and the two faces are completely indistinguishable in the dark. How do you separate the coins into two piles so that the number of face up heads in each pile are equal?
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  • KelseyDawn84
    KelseyDawn84 Posts: 129 Member
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    Turn on the light and look.
  • ket_the_jet
    ket_the_jet Posts: 1,257 Member
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    Take twelve random coins and flip them over. Put them in one pile. Everything else goes in the second pile.
    -wtk
  • briteshadow
    briteshadow Posts: 87
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    An EMP bomb has gone off rendering all technology useless and you don't have any candles. Also cheater.
  • briteshadow
    briteshadow Posts: 87
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    ket got it. Anyone else know any good ones. Also why does it work.
  • Feathil
    Feathil Posts: 163 Member
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    I could kinda see a way of making the probability of the two piles equal, but that wouldn't guarantee that they do turn out equal...
  • ChrisRS87
    ChrisRS87 Posts: 781 Member
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    if he flips 12 random ones, but 1 is already face up, then he'll have 11 new face up, and one of the original 12 will be tails. By putting those in the second pile you have 11 in each pile.


    Two coins add up to $.25, one is not a nickel. What are they?
  • ket_the_jet
    ket_the_jet Posts: 1,257 Member
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    Two coins add up to $.25, one is not a nickel. What are they?
    I believe the riddle is "thirty cents," not twenty-five.

    Anyway, you'd have a quarter and a nickel. Because only one is not a nickel.
    -wtk
  • ChrisRS87
    ChrisRS87 Posts: 781 Member
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    good catch. Obviously I didn't think of my own answer. lmao
  • ChrisRS87
    ChrisRS87 Posts: 781 Member
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    What gets wetter as it dries?
  • briteshadow
    briteshadow Posts: 87
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    The classic monty hall problem.

    Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1 [but the door is not opened], and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice?
  • EmCarroll1990
    EmCarroll1990 Posts: 2,849 Member
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    What gets wetter as it dries?

    A towel.
  • Ali_TSO
    Ali_TSO Posts: 1,172 Member
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    What gets wetter as it dries?

    a towel
  • briteshadow
    briteshadow Posts: 87
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    What gets wetter as it dries?

    towel
  • ChrisRS87
    ChrisRS87 Posts: 781 Member
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    The classic monty hall problem.

    Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1 [but the door is not opened], and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice?

    Yes, because door #2 now has a 66% chance of containing the prize. Your initial door kept its original 33% chance of winning while door #2 increased when door #3 was opened.
  • ChrisRS87
    ChrisRS87 Posts: 781 Member
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    What can be caught but not thrown?
  • Tonya0605
    Tonya0605 Posts: 111 Member
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    What goes up but never comes down?
  • EmCarroll1990
    EmCarroll1990 Posts: 2,849 Member
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    What can be caught but not thrown?

    A cold.
  • mnishi
    mnishi Posts: 422 Member
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    What gets wetter as it dries?

    A towel.
  • merrillfoster
    merrillfoster Posts: 855 Member
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    A room is completely empty except for a dead guy hanging from the (high) ceiling and a puddle. What happened?
  • mnishi
    mnishi Posts: 422 Member
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    What goes up but never comes down?

    My weight?

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