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test40 #10

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Master | Next Rank: 500 Posts
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test40 #10

by dunkin77 » Wed May 02, 2007 12:03 am
Hi,

I thought the answer should be B) but the answer sheet says E)...

Can anyone pls confirm?
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E

by patrik.herzog » Wed May 02, 2007 12:58 am
x = side of the square

x^2 = (x+30)(x-20)
x^2 = x^2 -20x +30x -600
x^2 = x^2 +10x -600
10x = 600
x = 60

Hence, the answer is E
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Master | Next Rank: 500 Posts
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by dunkin77 » Wed May 02, 2007 1:26 am
Oops, thanks.

I misunderstood the question that the area is 600. :oops:
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