OG DS ques.Not sure about the OA

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typhoonguywlblwu: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Fri Mar 27, 2009 4:11 am

by typhoonguywlblwu » Fri May 01, 2009 6:18 am

Hi! All,

Please find below,a DS ques from OG.I would appreciate if someone could kindly post the solution as i am unsure about the OA but it could just be that my brain is working overtime and i can't see the obvious;0).OA after few posts.

Thanks

ls lxl = y- z?
(1) x+y=z
(2) x<0

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Source: Beat The GMAT — Data Sufficiency | Fri May 01, 2009 6:18 am

schumi_gmat: Master | Next Rank: 500 Posts; Posts: 377; Joined: Wed Sep 03, 2008 9:30 amFollowed by: 2 members; Thanked: 15 times

by schumi_gmat » Fri May 01, 2009 8:33 am

From 1,

- x = y-z

we dont know the sign of x, hence insuff

from 2,
x<0
but doe not help to solve, insuff

Together,

-x = y-z, x<0
Therefore, mod(x) = y-z

ANS C

Rule:
mod(x) = -x for x<0
= x for x>0

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