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Senior Manager
Senior Manager
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Joined: 14 Aug 2006
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lt;spoiler> D </spoiler> [#permalink] New post 17 Dec 2006, 13:41
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
<spoiler>D</spoiler>
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Intern
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 [#permalink] New post 17 Dec 2006, 14:03
Given AB=OB=CO

1. COD = 60
=> COA=120

Let BOA=x = BAO => ABO=180-2x
=> OBC = 180-(180-2x) = 2x
Since OBC=OCB => OCB=2x

Since BOA=x => COB=120-x [since COA=120]

Now COB + OBC + OCB = 180 => 120 - x + 2x + 2x = 180

=> x=20= BAO. sufficient

2. Since BCO=40 => OBC=40 => ABO=140 => BAO=20

Hence D
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Director
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Joined: 01 Oct 2006
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 [#permalink] New post 19 Dec 2006, 10:48
posted a lot of times answer is D
  [#permalink] 19 Dec 2006, 10:48
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