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http://www.manhattangmat.com I am still working on this.

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Senior Manager
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http://www.manhattangmat.com I am still working on this. [#permalink] New post 16 Feb 2004, 07:17
http://www.manhattangmat.com

I am still working on this. Will check back later.
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 [#permalink] New post 16 Feb 2004, 08:12
I've got D

Not sure, if my approach is correct!
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 [#permalink] New post 16 Feb 2004, 08:14
The answer should be C.

The question: what is [(PI)R^2 - a] - [(pi)r^2 - a] = (pi)R^2 - (pi)r^2
= pi(R+r)(R-r) = ?

(a is the area of the overlapped portion)

Statement 1: R = r + 3k => R-r = 3k. We do not know the value of R+ r . So insuffecient.

Statement 2: will give the vale of R+r

Together: the answer would be 18(pi)

Answer C
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 [#permalink] New post 16 Feb 2004, 09:59
Answer should be C.
gmatblast's method is easy to follow.
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 [#permalink] New post 16 Feb 2004, 11:10
Yeah got the same.
C should be it.
  [#permalink] 16 Feb 2004, 11:10
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