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Source: — Data Sufficiency |
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Re: geometry question

by logitech » Fri Jan 02, 2009 11:56 am
ocean wrote:Hi,

can someone explain me, how to solve the attached ds question from the GMAT Prep Software? thx.

Regards
2x = x + Angle ABD

ABD = x

SO

AD = BD

and

BD = BC

Question asks BC

AD = BD = BC

St1 ) AD = 6 SUF
St2) x..INSUF no info given for lengths of the sides

Choose A
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by ocean » Sat Jan 03, 2009 3:05 am
Hi logitech,
A is the correct answer.

Unfortunately I don't yet understand your explanation.

Why is 2x = x + angle ABD?

Why is ABD = x?

thanks.
ocean
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by logitech » Sat Jan 03, 2009 8:40 am
Ocean, put this in a flash card. It will save you time.
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RULES.jpg
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