Question 7 (nov.15th)

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bacali: Master | Next Rank: 500 Posts; Posts: 245; Joined: Thu Aug 16, 2007 12:41 pm

by bacali » Sat Nov 15, 2008 4:53 pm

If s and t are two different numbers of the number line, is s+t equal to 0?
1) The distance between s and 0 is the same as the distance between t and 0.
2) 0 is between s and t.

OA: A

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Source: Beat The GMAT — Data Sufficiency | Sat Nov 15, 2008 4:53 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Sat Nov 15, 2008 5:04 pm

Stmt I)

Tell us that the absolute value of s and t is the same but one is positive and the other one is negative

Eg: s=5 t=-5 or t=5 s=-5

s+t is goign to be 0

SUFF

Stmt II
0 is between s and t (one is positive and the other negative)

For eg:

s=-5 t=-5 then s+t is 0
(or)
s=-10 t=20 then s+t not equal to 0

Since we dont anything about their distance from 0 i.e their positions on the number line there's no way to pinpoint to a single detrminable value for s+t

INSUFF

A)

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bacali: Master | Next Rank: 500 Posts; Posts: 245; Joined: Thu Aug 16, 2007 12:41 pm

by bacali » Sat Nov 15, 2008 5:09 pm

cramya wrote:Stmt I)

Tell us that the absolute value of s and t is the same but one is positive and the other one is negative

Eg: s=5 t=-5 or t=5 s=-5

s+t is goign to be 0

SUFF

Stmt II
0 is between s and t (one is positive and the other negative)

For eg:

s=-5 t=-5 then s+t is 0
(or)
s=-10 t=20 then s+t not equal to 0

Since we dont anything about their distance from 0 i.e their positions on the number line there's no way to pinpoint to a single detrminable value for s+t

INSUFF

A)

Oh thanks, I was just assuming that they'd be half way in between.

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