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# Can anyone give me a hint/solution why D is right here

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Joined: 09 Jan 2009
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Can anyone give me a hint/solution why D is right here [#permalink]  09 Jan 2009, 13:01
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Can anyone give me a hint/solution why D is right here?
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Re: GMAT Prep - DS Geometry Problem [#permalink]  09 Jan 2009, 14:47
troop2118 wrote:
Can anyone give me a hint/solution why D is right here?

1: 30+ANGLE Q + ANGLE PRQ = 180 ......................... 1
ANGLE PRS + ANGLE PRQ = 180 ............................... 2

From 1 and 2: Angle PRS - Angle PQR = 30

2: ANGLE PQR + ANGLE PRQ = 150 ......................... 3
ANGLE PRS + ANGLE PRQ = 180 ............................... 4

From 3 and 4: Angle PRS - Angle PQR = 30

So d.
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Re: GMAT Prep - DS Geometry Problem [#permalink]  09 Jan 2009, 16:48
pqr == q
prq = r
prq = 180-r
rps = 90-r
rpq = 180-(180-r)-q=r-q
(1)=>qpr=30=r-q=>hence sufficient.
(2)=>q+180-r=150=>hence sufficient.
troop2118 wrote:
Can anyone give me a hint/solution why D is right here?

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tusharvk

Re: GMAT Prep - DS Geometry Problem   [#permalink] 09 Jan 2009, 16:48
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