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Interesting logic puzzles and brain teasers

  1. Apr 14, 2013 #1
    I thought it would be cool to start a thread with a bunch of interesting logic puzzles, brain teasers, math problems, etc. I'll get the ball rolling:

    Solution: http://www.mindcipher.com/puzzles/141
     
  2. jcsd
  3. Apr 14, 2013 #2
    I'm not sure if this counts, because I would consider it using the scale more than once. But I would put 1 pill from each jar onto the scale, and then take them off one by one. When you take off a pill and the reading is an even number, you know you took off the 9 gram pill.
     
  4. Apr 14, 2013 #3

    Jonathan Scott

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  5. Apr 14, 2013 #4

    Curious3141

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    This belongs in the brainteaser thread.

    Anyway, the solution is quite trivial.

    SPOILER (white text):

    Label the jars 1 to 5. Take 9,8,7,6,5 pills from each jar respectively. The last digit of the weight will indicate which jar it is.

    EDIT: just saw the solution you linked, and honestly, I think mine's neater (posted it there as a comment). :wink:
     
    Last edited: Apr 14, 2013
  6. Apr 14, 2013 #5

    Evo

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    Thread moved.
     
  7. Apr 14, 2013 #6
    Did you think of that? Because that's pretty genius.
     
  8. Apr 14, 2013 #7
    Yeah that's a super clean solution!
     
  9. Apr 14, 2013 #8

    Curious3141

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    Yes, I did think of it, and thanks, but no, I don't think it's anything special.
     
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