og ds 105

stubbornp: Master | Next Rank: 500 Posts; Posts: 496; Joined: Sun May 04, 2008 11:01 pm; Location: mumbai; Thanked: 7 times; GMAT Score:640

Re: og ds 105

by stubbornp » Sun Nov 02, 2008 4:15 am

simba12123 wrote:Is absolute value x = y-z?

1. x+y=z
2. x<0

qa is c

question is rephrased as

is x < y-z? Is x>-y+z?

is there a concrete way to justify C.

stmt 1:x+y=z

x=z-y

x can be +ve or -ve...--insufficient

stmt b-x<0--dont have anything for y and z--insufficient

by combinig both,

we come to know x=z-y and x<0

means z-y<0

it means y-z>0

so |x|=y-z

IMO C...hope it clears now

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