Quantitative PS Help

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ellochewy: Junior | Next Rank: 30 Posts; Posts: 17; Joined: Thu Aug 04, 2011 11:24 am

by ellochewy » Mon Sep 12, 2011 11:21 pm

Can anyone please help me solve the following two math problems? I found these on the GMAT Prep software.
The correct answers are the choices that are boxed. Thank you sooooo much!

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Source: Beat The GMAT — Quantitative Reasoning | Mon Sep 12, 2011 11:21 pm

cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members; Location: India; Thanked: 310 times; GMAT Score:750

by cans » Tue Sep 13, 2011 1:17 am

1st one:
pqs + pus + x = 270 (=360-90) (sum of angles of quadrilateral)
a) alone is ob not sufficient and b) alone is also not sufficient
a&b) qr=rs thus, rqs = rsq and similarly, tsu=tus.
pqs = 180 - rqs (straight line) and pus = 180- tus
thus x -tus -rqs = -90. also rqs = rsq and tsu = tus
thus x - tsu - rsq = -90.
Also tsu + rsq +x = 180 -> 2x - 180 = -90 or x=45
Sufficient
IMO C

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cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members; Location: India; Thanked: 310 times; GMAT Score:750

by cans » Tue Sep 13, 2011 1:18 am

2nd:
circular table arrangements = (n-1)! (for n people)
as n=5, 4! = 24
IMO C

If my post helped you- let me know by pushing the thanks button

Contact me about long distance tutoring!
[email protected]

Cans!!

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