In the figure shown

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ssuarezo: Master | Next Rank: 500 Posts; Posts: 126; Joined: Wed Jun 24, 2009 1:12 pm; Location: Montreal; Thanked: 2 times; GMAT Score:510

by ssuarezo » Wed Jun 16, 2010 6:04 pm

Please, take a look at this.
thnks
Silvia

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Source: Beat The GMAT — Data Sufficiency | Wed Jun 16, 2010 6:04 pm

krazy800: Master | Next Rank: 500 Posts; Posts: 136; Joined: Sun Sep 28, 2008 8:20 pm; Location: fssf; Thanked: 17 times

by krazy800 » Wed Jun 16, 2010 8:12 pm

statement 1: angle QPR = 30

angle prs = angle qpr + angle qpr (exterior angle = sum of interior opposite angles)

angle prs-angle qpr = 30

sufficient

statement 2: angle pqr + angle prq =150

therefore angle QPR = 30

angle prs = angle rps + angle qpr (exterior angle = sum of interior opposite angles)

angle prs-angle QPR = 30

sufficient

IMO D

Last edited by krazy800 on Wed Jun 16, 2010 8:23 pm, edited 1 time in total.

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Wed Jun 16, 2010 8:20 pm

Look into this thread

https://www.beatthegmat.com/gmat-prep-qu ... 13176.html

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tpr-becky: GMAT Instructor; Posts: 509; Joined: Wed Apr 21, 2010 1:08 pmFollowed by: 85 members; Location: Irvine, CA; Thanked: 199 times; GMAT Score:750

by tpr-becky » Thu Jun 17, 2010 12:55 pm

These questions are really algebra questions related to the core concept in DS that if the number of variables equals the number of equations you can solve the problem.

Here you have 3 triangles and one straight line (QRS)- and you have 5 variables - (angle Q, QRS, RPQ, RPS, SRP - we know that s=90) Each triange has a formula that says the sum of its angles =180 and the line says the sum of its angles is also 180. Therefore you have 5 variables and 4 formulas - all you need to be able to solve is one more formula.

each of the answer choices gives you an additional formula so each is sufficient on its own - Answer D (by the way I've seen this problem with 7 triangles and it is the exact same problem.)

Becky
Master GMAT Instructor
The Princeton Review
Irvine, CA

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ssuarezo: Master | Next Rank: 500 Posts; Posts: 126; Joined: Wed Jun 24, 2009 1:12 pm; Location: Montreal; Thanked: 2 times; GMAT Score:510

by ssuarezo » Sun Jun 20, 2010 1:25 pm

Thanks Becky Selango and Krazy ...
Actually, I looked for this question, but found nothing .. maybe because it was an image embeded, and I looked for a text ... Anyway, Krazy, you're explanation is more than clear ...
And Becky, I'll watch carefully every image I see ...
Thanks
Silvia

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