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Princeton Review Drill - I don't understand [#permalink]

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30 Aug 2011, 04:06

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

14% (00:06) correct 86% (00:24) wrong based on 7 sessions

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In the PR Cracking the GMAT 2012 (Drill 7 #8 pg 196) there is a triangle not drawn to scale. It "appears" to be a an isosceles triangle with the the diagram drawn: Lower left angle is ~60 degrees with leg value A. Angle labeled X. The "top point" of the triangle at the top is labeled B with and drawn ~30degrees. No angle label. The final angle (lower right) is drawn ~60 degrees (labeled Y) and the leg is labeled C. The data sufficiency question is:

What is the value of x in ABC shown above? 1) Angle y = 80 degrees 2) AB = BC

I quickly determined it could only be C or E but chose the answer C because, if we know AB=AC and they are shown opposite the angles X and Y, can't we determine that X also equals 80 degrees? The PR says the answer is E beause "we don't actually know the two sides of the triangle are equal."

I'm confused - what does AB=BC mean if it doesn't mean they are equal? I appreciate any help you can give me. NC

Re: Princeton Review Drill - I don't understand [#permalink]

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10 Nov 2011, 20:20

It definitely looks like it should be C. I am in the same boat. Just starting my review and I'd hate to get something seemingly basic like this incorrect...is this confirmed?

Re: Princeton Review Drill - I don't understand [#permalink]

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22 Nov 2011, 06:38

No values given. we need to find x. 1.y=80 deg. We cannot find x from this since we don't know the other angle. NOT SUFFICIENT 2.given: AB=BC. implies x = y. But y = unknown. NOT SUFFICIENT If both are taken together, y=80 AND x=y, hence x=80. Hence, C.

Re: Princeton Review Drill - I don't understand [#permalink]

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23 Nov 2011, 06:40

Unless you made some error copying the question, the OA is incorrect. It should be C. If AB=BC, implies, it is an isosceles triangle. Hence, X=Y, and Y is given as 80. Thus X=80.