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Old 09-11-2010, 05:35 PM #1
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Default Some math help please.
Sounds silly and probably obvious but I need some help.. (Answering my friends math problem actually. She turned to me for advice but I couldn't help.. even though I'm getting A's and A*'s and she's on B/C level :L)

There are men and octopuses in a tank. In the tank there are a total of 11 heads and 52 legs. How many men and octopuses are there? And you have to find out using simultaneous equations.

It's been about a year and a half since we studied them, but I got up to here and then got stuck. Could someone please finish the workings and I'll probably get it then

X = Number of Men
Y = Number of Octopuses

X+Y=11
2X+8Y=52

...



Please help :L
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Old 09-11-2010, 05:36 PM #2
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18.

That is the answer.
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Old 09-11-2010, 05:37 PM #3
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y=6
x=5
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Old 09-11-2010, 05:38 PM #4
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y=6
x=5
Thanks, but how did you get that answer?
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Old 09-11-2010, 05:39 PM #5
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How many legs does an octopussy have?
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Old 09-11-2010, 05:39 PM #6
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Thanks, but how did you get that answer?
Well...

I worked out what numbers added together to make 11, and then tried doing the second sum

I dont know how to work algebra out right, always had a cheat way
Last edited by Vicky.; 09-11-2010 at 05:40 PM.
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Old 09-11-2010, 05:40 PM #7
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Old 09-11-2010, 05:41 PM #8
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omgz i did this today!!

X+Y=11 (equation 1)
2X+8Y=52 (equation 2)

X+Y=11 (x 2)
2X+2Y=22 (equation 3)

2X+2Y=22 (
2X+8Y = 52

(equation 2 - equation 3)
2X+8Y = 52 - 2X+2Y=22

6Y = 30 (divide by 6)
Y = 5

sorry had to use my book took awhile

and too find X u have to do what y is in the formula so

X+Y=11
(-5)
X = 6

so vicky is wrong as x = 6 and y = 5
Last edited by MeMyselfAndI; 09-11-2010 at 05:44 PM.
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Old 09-11-2010, 05:42 PM #9
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Omfg I've been doing things like this today
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Old 09-11-2010, 05:43 PM #10
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Omfg I've been doing things like this today
SAME! lol
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Old 09-11-2010, 05:46 PM #11
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leona lewis fans are the best at maths
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Old 09-11-2010, 05:48 PM #12
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so vicky is wrong as x = 6 and y = 5
Nice one

Was never much good at algebra. Never could work it out properly
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Old 09-11-2010, 06:29 PM #13
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Who needs algebra, when it's logical and obvious that there are 6 men and 5 octupuses?
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Old 09-11-2010, 06:30 PM #14
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I really don't get why we have to learn algebra, I swear you don't use it unless you're gonna be a maths teacher or something.
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Old 09-11-2010, 06:31 PM #15
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ahhh math
those were the days
ehh i dont have a clue i havent done alegbra in like 2 years
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Old 09-11-2010, 06:37 PM #16
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**** algebra, **** Math
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Old 09-11-2010, 06:49 PM #17
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I dont know how many times you've done that too me. you scare me every single time!!!! seriously :'(
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Old 09-11-2010, 07:09 PM #18
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I really don't get why we have to learn algebra, I swear you don't use it unless you're gonna be a maths teacher or something.
Careers in Design/Engineering/Construction use it at some points I think.
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Old 09-11-2010, 07:51 PM #19
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Ugh. Glad I don't have to do maths any more.
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Old 09-11-2010, 08:08 PM #20
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I dont know how many times you've done that too me. you scare me every single time!!!! seriously :'(


Sorry I was just answering Lewis' math question.
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