GMAT PREP ??

[dferm]

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

[Musiq]

Is the QA = A???

[dferm]

yes but can you explain.

[GMAT_crusher]

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]

[Sharbel]

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

[GMAT_crusher]

Got it.. thanks.