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Heya: Your local mathdimwit here come for some help

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IllusoryDeath
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Heya: Your local mathdimwit here come for some help
Howdy.
Help with these two, please?
....I'm 17, currently a junior in an IB college prep high school, and both of these 'simple' word problems are giving me a headache. This is like, what, prealgebraic stuff? Pathetic.
I do have to place the blame, however, upon the schools/mathematics classes that I have been in:
From the confession's topic:
IllusoryDeath Wrote:I confess that my state is known for being the secondworst in the entire nation when it comes to statewide math scores; Detroit being numero uno when it comes to suckassishness in the math dept.
Here are the little buggers:


01132010 11:49 AM 

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magikarp
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Re: Heya: Your local mathdimwit here come for some help
Basically, you just write down a bunch of equations.
There are 50 coins.
x + y + z = 50
They add up to 120 cents
x + 2y + 5z = 120
There are twice as many 2cent coins as 1cent coins.
2x = y
Then you can solve. Since y= 2x, you can replace it in the other equations.
x + 2(2x) + 5z = 120
5x + 5z = 120
x + z = 24
x + 2x + z = 50
3x + z = 50
Now it's probably easiest to solve for z in terms of x.
z = 24  x
z = 50  3x
Now, since they both equal z, they also equal each other.
50  3x = 24  x
26 = 2x
x = 13
So there are 13 1cent coins. It's pretty easy to find the 2cent coins now, because there are twice as many.
2(13) = y
26 = y
Now use one of the original equations to solve for z. (Can really be anything at this point as long as it includes z.)
13 + 26 + z = 50
z = 50  39
z = 11
The next one's simpler.
There are 50 stamps.
x + y = 50
Their total value is 202 cents.
2x + 5y = 202
Just solve each for y in terms of x.
y = 50  x
5y = 202  2x
y = (202  2x) /5
Now put them together again.
(202  2x)/ 5 = 50  x
202  2x = 250  5x
3x = 48
x = 16
Done, but you can still solve for y if you want to check.
16 + y = 50
y = 34
16(2) + 34(5) = 32 + 170 = 202 , so it works.
"Do we treat straight public sex differently than we do gay public sex? Of course. Straight people are so proud of their public sex that they named a cocktail after it."


01132010 01:01 PM 

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Loxor
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Re: Heya: Your local mathdimwit here come for some help
OH, that is what I was doing wrong in problem two.
Damn distributive property, or whatever.
Anything that ever happened or will... one condition, it has to be amazing.
I gave her wings but she don't wanna fly no more.
I'm sittin' on the dock of the bay
Watching the tide roll away
Ooo, I'm just sittin' on the dock of the bay
Wastin' time


01132010 03:52 PM 

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IllusoryDeath
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Re: Heya: Your local mathdimwit here come for some help
AAAAAAAAAAAAAAH, thank you magikarp. Wish my math studies teacher could explain the process in as simple terms as you have.


01142010 11:23 AM 

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aerftghyjk
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Re: Heya: Your local mathdimwit here come for some help
1. Lisa is a fictional character on the Simpsons, and therefor does not have ANY money. So the answers are 0.
2. Steve was recently robbed at gun point, so he has no money. Even worse: He died.
But yeah, those are the answers.


01162010 11:21 AM 

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IllusoryDeath
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Re: Heya: Your local mathdimwit here come for some help
But but but...Steve NEEDS stamps!!!!!!!!!! D8


01172010 02:35 AM 

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