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They have a triangle ABC, And a point D on AC. BDC = BCD =

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Director
Joined: 04 Jan 2006
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They have a triangle ABC, And a point D on AC. BDC = BCD = [#permalink]  14 Apr 2006, 18:15
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They have a triangle ABC, And a point D on AC. BDC = BCD = 2xdegree.
What is BC?

2) x = 36

They say AD = 6 is sufficient to know the length of BC.
I dont think so.. We know BD = BC, because angles are equal.. but I dont know how do they conclude AD = BD from this? Please help..

Has anyone else seen this?
Director
Joined: 04 Jan 2006
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I am attaching the diagram.. a word file xplaining it further..
Attachments

OGTriangle.doc [31 KiB]

Director
Joined: 04 Jan 2006
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Kudos [?]: 16 [0], given: 0

anyone any insight?

anyone who has solved this problem before from OG?
VP
Joined: 21 Sep 2003
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Re: OG Quant Review: DS, Chapter 5.5, Problem 117 wrong? [#permalink]  14 Apr 2006, 22:17
willget800 wrote:
Has anyone see this happen?

I think their answer is wrong..

They have a triangle ABC, And a point D on AC. BDC = BCD = 2xdegree.
What is BC?

2) x = 36

They say AD = 6 is sufficient to know the length of BC.
I dont think so.. We know BD = BC, because angles are equal.. but I dont know how do they conclude AD = BD from this? Please help..

Has anyone else seen this?

Something is defenitely missing. There's no way we can conclude AD=BD..
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Manager
Joined: 25 Mar 2006
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Location: Stonybrook Univ
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hey i have a friend who is a teacher for Kaplan ... he is the gmat MATH god lol ... il ask what he thinks and let you guys know ... from first glance i agree with you but im not sure im not that strong at the super tricky DS problems
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