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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by Target2009 » Sat Feb 26, 2011 6:16 pm
IMO A.

Angle DBC = 180 - ( 2X + 2X ) = 180 - 4X
Angle ABC = 180 - ( X + 2X) = 180 - 3X
Angle ABD = (180 - 3X ) - ( 180 - 4X) = X

This is equal to Anlge BAC = X So in triangle ADB angle BAD and ABD is same and there for AD = BD

in statement 1 AD = 6 so BD = 6 ..sufficient.
Statement 2 doesn't talk about length so insufficient.

Hence : Answer is A
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Abhishek
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by Goldfinger2001 » Sun Feb 27, 2011 12:58 am
Thanks Target!
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