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A fun puzzle

  1. Mar 26, 2016 #1

    davenn

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    so far I have come up with 5 possibilities
    Are there more ?
    what one/ones did the originator think of ?
    I wont post my answers till I see a few responses

    maths1.jpg

    Dave
     
  2. jcsd
  3. Mar 26, 2016 #2

    Samy_A

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    matches.jpg
     
  4. Mar 26, 2016 #3

    davenn

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    yup that's one of them try for another couple :)
     
  5. Mar 26, 2016 #4

    Borek

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    6-4≠4
     
  6. Mar 26, 2016 #5

    davenn

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    you are on to one of the good variations ... there are several of those
     
  7. Mar 26, 2016 #6

    micromass

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  8. Mar 26, 2016 #7

    Samy_A

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    A regular one, less fun than Borek's:

    8-4=4
     
  9. Mar 26, 2016 #8

    Samy_A

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    Another one
    0+4=4
    Variation on Borek's method:
    5+4≠4
     
  10. Mar 26, 2016 #9

    Ibix

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    Hee are four
    5+4=9
    8-4=4
    5+4##\neq##4
    6-4##\neq##4
    Edit: although nothing anyone else didn't come up with, I see.
    Edit edit: fixed typo (x2)
     
    Last edited: Mar 27, 2016
  11. Mar 26, 2016 #10

    davenn

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    :smile:

    awesome, between the 3 of you, you have covered the 5 that I found

    I am not sure if there are others or not

    Dave
     
  12. Mar 26, 2016 #11

    davenn

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    have you found the 5th one ? :wink:

    you posted the edit while I was posting
     
  13. Mar 26, 2016 #12

    Ibix

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    Yeah - I clicked on the spoiler in Samy's #8 and there it was. :wink:

    I got the other four without looking.
     
  14. Mar 26, 2016 #13
    I question this one on the grounds it violates conservation of mass: a matchstick has appeared magically where there was none before.
     
  15. Mar 26, 2016 #14

    Ibix

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    Indeed - I've corrected the typo.
     
  16. Mar 26, 2016 #15

    davenn

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    you better go back and re-edit :wink:
    you have 2 the same now
     
  17. Mar 27, 2016 #16

    Ibix

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    Gah! I think it's right now. I wish I'd been drinking yesterday so I had an excuse for that...
     
  18. Mar 27, 2016 #17

    Ibix

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    Wait - my original typo (preserved by Zooby) is valid if you are happy to accept a slightly malformed 6. Take the top bar of the 6 - the result is recognisably a 6. Or is that cheating?
     
  19. Mar 27, 2016 #18

    OmCheeto

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    I could come up with only 3 new ones.

    A: Take a match from either the 6 or + , and light the 6 and + on fire, leaving 4 = 4

    B: Pick up any match, wave it in someones face and say; "I'm MOVING it.", and then put it back where it was, as the equation is correct in modulo 6. [ref]

    C: 6 + 4 = 11 in base 9
     
  20. Mar 27, 2016 #19

    mfb

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    The energy of the unbalanced equation got converted to the atoms of a matchstick.
    6=4=4 mod 2
    6-H=4 for suitable H
    6-4=H and a few more similar ways.
    6+4+4 - it fixes the problem that there was an equation?
    6-4=4 - then use the match to threaten someone to fix the equation in any way. You move one match to fix the equation.
     
  21. Mar 27, 2016 #20

    OmCheeto

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    You're solution #4 reminds me of a variation of my first solution

    Take one match and light all the rest of them on fire.

    ps. I can't stop laughing about your last one. :oldlaugh:
     
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