Wengen wrote:

Since the original question is - Is a/b<0, can I rewrite the question as Is a<0 ? If I do this, I arrive at (2) is enough to answer. But as per MGMAT, (1) and (2) are sufficient to answer. What am I missing? Why should'nt I rewrite the q as is a<0 ?

Can you please help. Thanks

You can rewrite the question this way only if you are sure that b>0, but it is not given. It can be either b<0 and a>0 or b>0 and a<0.

Statement 1 gives us b>0, nothing about a - insuff.

Statement 2 gives us a<0, nothing about b - insuff.

Together - sufficient, C.