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  1. #11
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    Quote Originally Posted by GM01 View Post
    Assuming one rider per horse, the number of horses is 42.

    X = horses
    2X = heads (one per horse and one per rider)
    6X = legs (four per horse plus two per rider)

    The equation given is Legs = 84 + 2 x Heads

    Therefore:

    6X = 84 + 2 x (2X)
    6X = 84 + 4X
    6X - 4X = 84 (+4X - 4X)
    2X = 84
    X = 42
    Ahhhhh! I was using x for heads & y for legs x = 2y + 84
    But of course, they can all be x because they all relate, in proportion!
    Clever cookie @GM01!

  2. #12
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    Quote Originally Posted by phoebebebe View Post
    oh i totally invented a comma in there, "84, more than the number of legs"
    in which case, i got nothin!
    Join the club lol!

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    Quote Originally Posted by Gothel View Post
    Join the club lol!


    i should have known i'd read it wrong when it was too easy...

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  5. #14
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    Nice work. All the answers online said 42.

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  7. #15
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    Quote Originally Posted by anewme View Post
    Is it 21

    21 horse plus 21 riders is 126 legs.
    Minus 42 heads is 84 legs .

    I am hopeless at this
    That's a good way of coming at the problem . You're not hopeless! This is a tough one, I've been working through a book of problems and this one had me stumped.

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    Quote Originally Posted by Gothel View Post
    Ahhhhh! I was using x for heads & y for legs x = 2y + 84
    But of course, they can all be x because they all relate, in proportion!
    Clever cookie @GM01!
    You could actually use x and y and get to the same solution, you'd just need a separate equation so that you can equate one of the variables to cancel it out.

    y = 3x (3 legs for each head per horse rider combo), &
    y = 2x + 84

    y = y
    3x = 2x + 84
    3x - 2x = (2x - 2x) + 84
    x = 84

    As x was heads and not horses in this example equation, then the number of horses is 1/2 x, 42.


    ..
    ...

    Yes, insert giant nerd symbol here!!! I'm very good at maths

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  10. #17
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    That's ringing bells from high school maths *cough* 25 years ago!
    I was doing
    L = 2H + 84 and had realised I could do 1H/3L per unit but didn't think to combine them like that.

    Dammit I can see what you're doing but I can't quite *understand* it !!!

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    When I was in high school and I'd get a question like that I'd write an essay on why horse riding was cruel to the horses and why I felt I couldn't answer the question as I needed evidence they were fairly treated.

    Yes, that is why I became a lawyer and not a mathematician.

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    Full House  (20-08-2014),GM01  (20-08-2014),Gothel  (20-08-2014),LoveLivesHere  (20-08-2014),Ngaiz  (20-08-2014)

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    Quote Originally Posted by Sonja View Post
    Yes, that is why I became a lawyer and not a mathematician.
    Funnily enough.. I'm studying law at the moment!!
    I may need to release some of my maths knowledge to accommodate some spelling and grammar

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    Nah it was just my way of hiding the fact when it came to maths I had NFI.

    Maths actually comes in very handy with law. You should ace it


 

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