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GHong14: Master | Next Rank: 500 Posts; Posts: 155; Joined: Sat Oct 16, 2010 6:32 pm; Thanked: 3 times

by GHong14 » Tue Dec 14, 2010 4:07 pm

Can anyone explain why the selected answer is wrong

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Source: Beat The GMAT — Data Sufficiency | Tue Dec 14, 2010 4:07 pm

ov25: Master | Next Rank: 500 Posts; Posts: 201; Joined: Sat Jul 10, 2010 2:23 pmFollowed by: 1 member; Thanked: 7 times

by ov25 » Tue Dec 14, 2010 5:30 pm

i) QPR=30 no info about other angles other than 90^o one. 30, 30, 120; 30, 60 and 90 or 30, 15, 135; 45, 45, 90 - INSUFF
ii) we have both options 30, 30, 120; 30, 60 and 90 or 30, 15, 135; 45, 45, 90 -INSUFF
Together no improvement
So E

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