BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Difficult DS from GMAT PREPE

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 215
Joined: Sat Jun 14, 2008 4:24 pm
Thanked: 13 times
Followed by:1 members

Difficult DS from GMAT PREPE

by 1947 » Wed Sep 07, 2011 9:50 pm
Please tell me how much time did it take for you....I had to leave this in test as it was taking more than 4 minutes. Experts please tell how to solve this within 3 minutes,
Thanks
Attachments
Doc1.docx
(68.33 KiB) Downloaded 92 times
Top
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1309
Joined: Mon Apr 04, 2011 5:34 am
Location: India
Thanked: 310 times
Followed by:123 members
GMAT Score:750

by cans » Wed Sep 07, 2011 10:38 pm
It is max 2 min question.
first of all you should know that sum of angles of triangle = 180. and thus in triangle pqr,
qpr + pqr + prq = 180 and thus option A and B are same.
Thus answer is either D or E.
now we have to find prs - pqr.
in triangle prs, rps + prs = 90
and in triangle pqs, pqs + qps = 90. pqs = pqr. thus pqr + qps = 90.
also rps = qps - qpr.
Thus qps - qpr + prs = pqr + qps -> prs - pqr = qpr = 30
Sufficient
IMO D
If my post helped you- let me know by pushing the thanks button ;)

Contact me about long distance tutoring!
[email protected]

Cans!!
Top
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pm
Thanked: 158 times
Followed by:21 members

by pemdas » Wed Sep 07, 2011 10:44 pm
agree with cans, both options are the same st(1)=st(2), hence d

we need to find prs-pqr=?

st(1) qpr=30`, pqr+prq=150` , pqr=150`-prq and prs-150`+prq=prs-pqr. Since prs+prq=180` we rewrite 180-150=prs-pqr=30 is Sufficient
st(2) pqr+prq=150`, the same as above Sufficient
Attachments
image-converted.JPG
Success doesn't come overnight!
Top
Master | Next Rank: 500 Posts
Posts: 215
Joined: Sat Jun 14, 2008 4:24 pm
Thanked: 13 times
Followed by:1 members

by 1947 » Thu Sep 08, 2011 9:19 pm
Thanks everyone.... I agree now that it is around 2 min question....and I should have solved it,
But at times in exam like situation it gets tough to solve.
Thanks anyways...
Top
Post new topic Post Reply
• Page 1 of 1