test40 #10

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

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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Source: Beat The GMAT — Problem Solving | Wed May 02, 2007 12:03 am

patrik.herzog: Junior | Next Rank: 30 Posts; Posts: 12; Joined: Wed Jan 31, 2007 8:26 am; Thanked: 1 times

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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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Wed May 02, 2007 1:26 am

Oops, thanks.

I misunderstood the question that the area is 600.

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