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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

GMAT PREP ??

by dferm » Fri Apr 18, 2008 7:12 am

If s and t are two different numbers on 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

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Source: Beat The GMAT — Data Sufficiency | Fri Apr 18, 2008 7:12 am

Musiq: Senior | Next Rank: 100 Posts; Posts: 93; Joined: Thu Apr 10, 2008 1:42 pm; Location: Chicago; Thanked: 20 times

by Musiq » Fri Apr 18, 2008 7:21 am

Is the QA = A???

For love, not money.

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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

by dferm » Fri Apr 18, 2008 7:25 am

yes but can you explain.

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GMAT_crusher: Junior | Next Rank: 30 Posts; Posts: 25; Joined: Mon Mar 31, 2008 6:09 pm

by GMAT_crusher » Fri Apr 18, 2008 10:59 am

I would have checked C

1] Not suff.
s------2------0------2------t
s =-2
t = 2
s+t = 0
OR

0--------2--------ST
s=2
t=2
s+t = 4

2] Not suff.
s------2-----0------2------t
s= -2
t=2
s+t = 0

OR

s------3-----0-----2-----t (between does not mean bisecting).
s= -3
t=2
s+t= -1

[1]+[2] Suff.

s------2-----0------2------t
s= -2
t=2
s+t = 0

ANS [C]

it would interesting to see the explainantion from Musiq for [A]

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Sharbel: Junior | Next Rank: 30 Posts; Posts: 17; Joined: Sat Mar 08, 2008 5:51 am; Location: Saudi Arabia

The explanation for {A} is:

by Sharbel » Fri Apr 18, 2008 11:41 am

in your answer you considered 1 to be insufficient because :

0--------2--------ST
s=2
t=2
s+t = 4

this is not possible because in the question stem it is mentioned that s and t are different numbers on the number line so they can not both be 2.

so i guess it is A

regards

Sharbel Nasr