Can anyone get this tricky math problem?

Discussion in 'Community Discussion' started by Frisco, Feb 8, 2008.

  1. macrumors 68020

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    #1
    Just for fun, not for class. I can't get it.

    Good luck with this and have fun! This is a 5th grade math problem.
    If you can't stand word math problems, just delete now. If you can open the
    spreadsheet, you'll see it's a very small list of people who have gotten
    the correct number. This is not a trick question. This is a real math
    problem so don't say that a bus has no legs.


    There are 7 girls in a bus

    Each girl has 7 backpacks

    In each backpack, there are 7 big cats

    For every big cat there are 7 little cats

    Question: How many legs are there in the bus?


    The number of legs is the password to unlock the Excel sheet. (Do not have to spell out #)
    If you open it.

    Spreadsheet
     
  2. macrumors regular

    mactastic1971

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  3. thread starter macrumors 68020

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    #3
    Dude no spam here!
     
  4. Moderator

    Nermal

    Staff Member

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  5. macrumors regular

    mactastic1971

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    #5
    Answer this question honestly...

    If you were a spammer, and somebody asked you if you were a spammer would you reply, "no I am not a spammer" ?
     
  6. thread starter macrumors 68020

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    #6
    I have been a member since 2002 and just start spamming now? Answer the question or move on :rolleyes:
     
  7. Moderator emeritus

    EricNau

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    San Francisco, CA
    #7
    I got 9604.

    7 girls x 7 backpacks x 7 big cats = 343 big cats x 7 little cats = 2401

    2401 x 4 legs each = 9604

    ...but it's wrong. :confused:

    EDIT: forgot the girls. 2401 + 7 = 2408 x 4 = 9632 ...but that's wrong too! :D
     
  8. macrumors regular

    mactastic1971

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    #8
    girls have 2 legs - not four
     
  9. macrumors 603

    swiftaw

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    Omaha, NE, USA
    #9
    The answer is 10990

    7 girls * 2 legs each = 14 legs

    7 backpacks per girl = 49 backpacks
    7 large cats per backpack = 343 large cats = 1372 legs on the large cats

    7 small cats per large cat = 2401 small cats = 9604 legs in the small cats.

    Total legs = 9604+1372+14 = 10990
     
  10. macrumors 6502

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    #10
    Plus 14 girl legs.

    edit: uhh, as the above said.
     
  11. thread starter macrumors 68020

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    #11
    Thank you so much!!! I would have never gotten it.

    ps: No spam here
     
  12. macrumors 6502a

    dobbin

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    #12
    I don't see why this is at all hard. It seems very simple to me.

    7 girls --> 14 legs
    7x7 = 49 backpacks
    49x7 = 343 big cats --> 1372 legs
    343x7 = 2401 little cats --> 9604 legs
    14+1372+9604 = 10990 legs in total
     
  13. macrumors 603

    mrkramer

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  14. Moderator emeritus

    EricNau

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    #14
    Looks like I also forgot to account for the big cat's legs. That's what I get for talking on the phone while doing a math problem, I suppose.


    But what about the bus driver?
     
  15. thread starter macrumors 68020

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    #15
    Well it was very hard for me. I was never good at math.

    ps: I was multiplying in the wrong order: Big cats--little cats really confused me.
     
  16. Administrator

    Doctor Q

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    #16
    That puzzle sounds like yet another variation on this classic, thought to have originated in 1650 BC!

    How 'bout this puzzle? -

    A bookshelf has three encyclopedia volumes: A-I, J-R, and S-Z. They are in the usual order, left to right on the shelf. The covers are 1/16" thick. Each book has pages numbered 1 to 1000. Each sheet of paper is 1/250 of an inch thick.

    If a bookworm chews its way from page 1 of the A-I volume through page 1000 of the S-Z volume, how far did it travel?

    (You may decide whether or not the bookworm ate the starting page and the ending page; use whichever assumption makes your computation easier.)
     
  17. macrumors 603

    swiftaw

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    #17
    6.25 inches
     
  18. Moderator emeritus

    EricNau

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    #18
    Maybe I'm miss-reading the problem, but wouldn't it be 12.25 inches?
     
  19. macrumors 603

    swiftaw

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    #19
    Nope, how many pieces of paper needed to make 1000 pages?
     
  20. Moderator emeritus

    EricNau

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    #20
    Well, if you think like me, 1000. ;)
     
  21. Moderator

    Nermal

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    #21
    2.25".
     
  22. macrumors 68020

    yippy

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    #22
    That would be 12.25"

    There are 3000 pages total, 1000 for each of the 3 books.
     
  23. macrumors 603

    swiftaw

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    #23
    how many pieces of paper needed to make 1000 pages?
     
  24. macrumors 65816

    monke

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    May 30, 2005
    #24
    Agreed.

    1000 pages = 500 sheets. 1 page on one side, 1 page on the other.
    The worm chews through 500 sheets in the A-I book, then the cover.
    It then chews through the J-R front cover, 500 sheets, and the back cover.
    Then the S-Z cover, 500 sheets, and it stops dead.
     
  25. macrumors 68020

    R.Youden

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    Apr 1, 2005
    #25
    500....
     

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