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Brain Teaser Thread

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  • direwolf987
    7465 posts Member
    edited September 2015
    81942

    Edit: Assuming a prime digit is the same as a prime number
  • tappedout1996
    3045 posts
    edited September 2015
    81942

    Edit: Assuming a prime digit is the same as a prime number
    Digits 2, 4 and 5 are correct, your answer only contains one prime number.
  • ZAINH17__ZSH
    2739 posts
    edited September 2015
    71842

    btw 1 is not a prime number :mrgreen:
  • direwolf987
    7465 posts Member
    edited September 2015
    I forgot 1 wasn't a prime number due to the language of the stupid rule :oops:
  • ForumNerds
    2465 posts Member
    edited September 2015
    I forgot 1 wasn't a prime number due to the language of the stupid rule :oops:

    Don't feel so bad. I forgot that the number "2" WAS a prime number. :oops:
  • tappedout1996
    3045 posts
    edited September 2015
    I forgot 1 wasn't a prime number due to the language of the stupid rule :oops:
    I'm sorry for the confusion, I type them as they are in my puzzle book.
  • tappedout1996
    3045 posts
    edited September 2015
    71842
    Correct
  • tappedout1996
    3045 posts
    edited September 2015
    Standings

    1st - Wilki1999 (5)
    2nd - mrsoctober12 (3)
    3rd - ForumNerds, ZAINH17_ZSH (2)
    4th - direwolf987, MuskiePlunge (1)
  • tappedout1996
    3045 posts
    edited September 2015
    Puzzle 15

    Complete this grid with the numbers 1 to 6 to make the sum correct.

    Each number is only used once.

    There is no ÷ 1, and at no point is a decimal or fraction used.

    _ + _ - _ × _ ÷ _ × _ = 50
  • direwolf987
    7465 posts Member
    edited September 2015
    This is not here
    Post edited by Unknown User on
  • wilki1999
    3974 posts Member
    edited September 2015
    This took me a while to work out:

    It would have to be 4 add 2 - 1 x 6 divided by 3 x 5. That must be the only logical solution?
  • direwolf987
    7465 posts Member
    edited September 2015
    After looking at the question and realizing it's impossible I looked up the answer on the internet. What wilki has is what the internet states, but if you do the math it is incorrect. Wilki's anwwer actually equals -4

    4 + 2 - 1 x 6 ÷ 3 x 5

    First you add the stuff not attached to multipliers/dividers
    (2 + 4) - (1 × 6) ÷ 3 × 5 which equals 6 - 1 × 6 ÷ 3 × 5

    Then you multiply/divide left to right
    6 - 1 × 6 ÷ 3 × 5 which equals 6 - 6 ÷ 3 x 5

    Again multiply/divide left to right
    6 - 6 ÷ 3 × 5 which equals 6 - 2 × 5

    One more time
    6 - 2 × 5 which equals 6 - 10

    Finally you have
    6 - 10 = -4
  • wilki1999
    3974 posts Member
    edited September 2015
    After looking at the question and realizing it's impossible I looked up the answer on the internet. What wilki has is what the internet states, but if you do the math it is incorrect. Wilki's anwwer actually equals -4

    4 + 2 - 1 x 6 ÷ 3 x 5

    First you add the stuff not attached to multipliers/dividers
    (2 + 4) - (1 × 6) ÷ 3 × 5 which equals 6 - 1 × 6 ÷ 3 × 5

    Then you multiply/divide left to right
    6 - 1 × 6 ÷ 3 × 5 which equals 6 - 6 ÷ 3 x 5

    Again multiply/divide left to right
    6 - 6 ÷ 3 × 5 which equals 6 - 2 × 5

    One more time
    6 - 2 × 5 which equals 6 - 10

    Finally you have
    6 - 10 = -4

    Yes, I know what you mean. BIDMAS is what they tell us at school: brackets, indices, division, multiplication, addition, subtraction. I was going by the theory that you need to work from left to right. However, technically dire wolf is right, although I think the answer I've got is likely to be listed as the correct answer. I'm happy to forfeit the point if it is listed as the correct answer because it technically isn't. Unless I'm completely wrong in which case disregard this post.
  • direwolf987
    7465 posts Member
    edited September 2015
    Your answer is correct according to the internet, actually it was 2 + 4 but that's irrelevant. In the example I found it stated "work left to right" which is what you did. Looks like we may both be right :D
  • ZAINH17__ZSH
    2739 posts
    edited September 2015
    I don't think that sum can work with BIDMAS, so I believe Wilki is right. :D
  • tappedout1996
    3045 posts
    edited September 2015
    wilki1999 wrote:
    This took me a while to work out:

    It would have to be 4 add 2 - 1 x 6 divided by 3 x 5. That must be the only logical solution?
    After looking at the question and realizing it's impossible I looked up the answer on the internet. What wilki has is what the internet states, but if you do the math it is incorrect. Wilki's anwwer actually equals -4

    4 + 2 - 1 x 6 ÷ 3 x 5

    First you add the stuff not attached to multipliers/dividers
    (2 + 4) - (1 × 6) ÷ 3 × 5 which equals 6 - 1 × 6 ÷ 3 × 5

    Then you multiply/divide left to right
    6 - 1 × 6 ÷ 3 × 5 which equals 6 - 6 ÷ 3 x 5

    Again multiply/divide left to right
    6 - 6 ÷ 3 × 5 which equals 6 - 2 × 5

    One more time
    6 - 2 × 5 which equals 6 - 10

    Finally you have
    6 - 10 = -4
    The answer listed is what wilki has put, however, since direwolf's answer makes sense I think I will give half points to both of you if that's alright with you two?
  • wilki1999
    3974 posts Member
    edited September 2015
    wilki1999 wrote:
    This took me a while to work out:

    It would have to be 4 add 2 - 1 x 6 divided by 3 x 5. That must be the only logical solution?
    After looking at the question and realizing it's impossible I looked up the answer on the internet. What wilki has is what the internet states, but if you do the math it is incorrect. Wilki's anwwer actually equals -4

    4 + 2 - 1 x 6 ÷ 3 x 5

    First you add the stuff not attached to multipliers/dividers
    (2 + 4) - (1 × 6) ÷ 3 × 5 which equals 6 - 1 × 6 ÷ 3 × 5

    Then you multiply/divide left to right
    6 - 1 × 6 ÷ 3 × 5 which equals 6 - 6 ÷ 3 x 5

    Again multiply/divide left to right
    6 - 6 ÷ 3 × 5 which equals 6 - 2 × 5

    One more time
    6 - 2 × 5 which equals 6 - 10

    Finally you have
    6 - 10 = -4
    The answer listed is what wilki has put, however, since direwolf's answer makes sense I think I will give half points to both of you if that's alright with you two?

    Im happy either way
  • direwolf987
    7465 posts Member
    edited September 2015
    wilki1999 wrote:
    wilki1999 wrote:
    This took me a while to work out:

    It would have to be 4 add 2 - 1 x 6 divided by 3 x 5. That must be the only logical solution?
    After looking at the question and realizing it's impossible I looked up the answer on the internet. What wilki has is what the internet states, but if you do the math it is incorrect. Wilki's anwwer actually equals -4

    4 + 2 - 1 x 6 ÷ 3 x 5

    First you add the stuff not attached to multipliers/dividers
    (2 + 4) - (1 × 6) ÷ 3 × 5 which equals 6 - 1 × 6 ÷ 3 × 5

    Then you multiply/divide left to right
    6 - 1 × 6 ÷ 3 × 5 which equals 6 - 6 ÷ 3 x 5

    Again multiply/divide left to right
    6 - 6 ÷ 3 × 5 which equals 6 - 2 × 5

    One more time
    6 - 2 × 5 which equals 6 - 10

    Finally you have
    6 - 10 = -4
    The answer listed is what wilki has put, however, since direwolf's answer makes sense I think I will give half points to both of you if that's alright with you two?

    Im happy either way

    I say just give the point to Wilki. Wilki's answer is actually an answer. I answered nothing :lol:
  • tappedout1996
    3045 posts
    edited September 2015
    wilki1999 wrote:
    Im happy either way
    I say just give the point to Wilki. Wilki's answer is actually an answer. I answered nothing :lol:
    In the UK, maths exams always give extra marks for working out so I think direwolf deserves half a point. :D
  • tappedout1996
    3045 posts
    edited September 2015
    Standings

    1st - Wilki1999 (5.5)
    2nd - mrsoctober12 (3)
    3rd - ForumNerds, ZAINH17_ZSH (2)
    4th - direwolf987 (1.5)
    5th - MuskiePlunge (1)
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