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# I think i saw this problem somewhere but couldn't find. Can

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Joined: 10 Jul 2009
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I think i saw this problem somewhere but couldn't find. Can [#permalink]  03 Sep 2009, 09:42
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I think i saw this problem somewhere but couldn't find. Can anybody guide through the solution.
THanks
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DS1.jpg [ 14.51 KiB | Viewed 722 times ]

Current Student
Joined: 12 Jun 2009
Posts: 1847
Location: United States (NC)
Concentration: Strategy, Finance
Schools: UNC (Kenan-Flagler) - Class of 2013
GMAT 1: 720 Q49 V39
WE: Programming (Computer Software)
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Re: GMAT Prep Triangle DS [#permalink]  03 Sep 2009, 10:13
1. SUFF.

Lets say angle ABD is Y. We know angle BDC is 2x and that angles ABD + BAD = 2x since angle BDA is 180-DBC(2x) and so Y+X = 2x so we can figure out Y =X. With equal angles AD=BD. and in turn BD=BC

2. INSUFF since we might figure out the property like 1 but no known length to work with.

A
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Joined: 03 Jul 2009
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Location: Brazil
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Re: GMAT Prep Triangle DS [#permalink]  14 Sep 2009, 12:19
shaselai, good explanation. I did the same process and I believe this is the fastest one.
Re: GMAT Prep Triangle DS   [#permalink] 14 Sep 2009, 12:19
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