Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    Gold Member

  5. Apr 14, 2013 #4


    User Avatar
    Homework Helper

    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


    User Avatar

    Staff: Mentor

    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


    User Avatar
    Homework Helper

    Yes, I did think of it, and thanks, but no, I don't think it's anything special.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook