# who's a maths wiz? Help me out!

1. Originally Posted by GM01
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!

2. Originally Posted by phoebebebe
oh i totally invented a comma in there, &quot;84, more than the number of legs&quot;
in which case, i got nothin!
Join the club lol!

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Originally Posted by Gothel
Join the club lol!

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

4. ## The Following User Says Thank You to phoebebebe For This Useful Post:

Gothel  (20-08-2014)

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

6. ## The Following User Says Thank You to Best Things For This Useful Post:

Gothel  (20-08-2014)

7. Originally Posted by anewme
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.

8. Originally Posted by Gothel
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!
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

9. ## The Following User Says Thank You to GM01 For This Useful Post:

PinkPopsicle  (20-08-2014)

10. 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 !!!

11. 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.

12. ## The Following 5 Users Say Thank You to Sonja For This Useful Post:

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

13. Originally Posted by Sonja
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

14. 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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