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Thread: number pyramid

  1. #1
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    number pyramid

    Hello all,

    I am new to the site and hope to interact with you all soon as I am starting to love math puzzles. So there are two pyramids like things. I've solved the second in case it helps with the first.
    2
    |
    ?-28-?

    |
    4-?-3


    4
    |
    10-?-9
    |
    ?-?-5



    spoiler for second
    Mid 34 bottom 6 and 11
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  2. #2
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    Re: number pyramid

    Code:
           4
     10    a    9
      b    c    5
    
           4
     10   34    9
      6   11    5
    Okkkkk...so seems that given is a lonely number at top,
    then 3 numbers somewhere in a 2nd and 3rd row of 3
    numbers per row, leaving 3 numbers a,b,c to be found.

    You solved above: a=34, b=6 and c=11

    But what "rules" did you use?
    You've given nothing to work with...
    Is this a standard puzzle that everyone should know?
    WHY is your answer "correct"?
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  3. #3
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    Re: number pyramid

    It's from this game Strangest Island Escape. When comparing the two pyramids I think I just accidentally got the answer. I started with the premise the the second pyramid's c would start with 11 because 9, 10, 11, then 6 plus 5 equals 11, then add 9, 10 and 4 = 34. However, the same logic does not work for the first pyramid i.e. a=9, b=8, c=7. What's more 9 + 8 + 7 + 2 = 26, not 28. Also, a = 10, b = 9, c = 7 while all plus 2 = 28 this does not work either Neither does a = 9, b = 8, c = 9
    So I started thinking that the numbers surrounding 28 should add up to equal 28. I went through a lot of iterations though. I'm really not sure where to go from here.

    I think the answer lies somewhere in the comparison between the two
    Notice where Pyramid 2 has
    4
    - - -
    6 - 5
    and
    -
    10 - 9
    - 11 -

    I think this pattern should be used for pyramid one.
    because of
    2
    - - -
    4 - 3
    Last edited by rival27; Nov 18th 2015 at 08:21 PM.
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  4. #4
    MHF Contributor
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    Re: number pyramid

    Take over Dan....I got a headache...
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  5. #5
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    Re: number pyramid

    erghh. I've been trying to figure this out for a couple months now
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