From GMATPrep :
If s and t are 2 different numbers on the number line, is s+t=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
The answer is A, but I cannot understand why, can you ?
I was sure it was C.
As far as I understand the first statement, it only says that |s|=|t|, but it does not tell anything more.
Thank you for your help
Given s and t are 2 different nos
is s+t = 0?
i.e. is s = -t ?
St1: Since the distance between s and 0 and t and 0 are the same and they are 2 different points.
One is +ve and the other -ve so sum = 0 ----Suff.
St2: 0 is between s and t but it does not say if 0 is the mid-point.
s = -t only if 0 is exactly in the middle.---Hence Insuff
Ans is A.