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hrn423: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Tue Jun 26, 2007 3:29 pm

by hrn423 » Tue Jun 26, 2007 6:03 pm

I am new (test on Saturday and stressing)

Please see attached. Explanation is appreciated[/img]

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Source: Beat The GMAT — Data Sufficiency | Tue Jun 26, 2007 6:03 pm

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member; Location: Silicon valley, California; Thanked: 30 times

by jayhawk2001 » Tue Jun 26, 2007 9:13 pm

1- sufficient.
Exterior angle PRS = sum of interior opposite angles
= angle RPQ + angle PQR
= PRS - PQR = RPQ.
We know the difference and hence is sufficient.

2 - sufficient.
PQR + PRQ = 150
We know PRQ = 180 - angle-PRS
PQR + 180 - PRS = 150
We can hence find PRS - PQR

Hence D

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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Sun Jul 01, 2007 9:43 am

Excellent approach Jayhawk..

Maxx

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