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Dont get it.

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by ajmoney09 » Thu Jan 22, 2009 4:04 pm
Image

Okay i said C because....

IF we know that A is equal to 800 then the other half is equal to 2 hundred as well....

Now on the bottom we can read that 2D = 1C 2C = B 4D = B

Thus, we can conclude B+C+2D = 800
then substitute for B and C we get 4D + 2D + 2D = 800 then we solve for D we get 100....

So why is it E and not C?
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by hypik21 » Thu Jan 22, 2009 4:25 pm
we dont know the area of the blank panel that is unlabeled.
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by ajmoney09 » Thu Jan 22, 2009 4:29 pm
hypik21 wrote:we dont know the area of the blank panel that is unlabeled.
If C equals 2D then can't we assume that the blank panel is also D?
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by gaggleofgirls » Thu Jan 22, 2009 4:44 pm
No, we can't assume that.

-Carrie
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by awesomeusername » Thu Jan 22, 2009 7:21 pm
Wow, this is a tricky one... but I think they're all right.

Since it's not in scale, here's an example that sheds a bit more light on the problem drawn to as close as scale as I could to prove that both conditions don't imply the blank space is D. I think it's much easier to understand with something visual. It had me thinking for a bit too...
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