Can two statements have two different answers ?

[gmatman7]

Hey fellows, these may sounds crazy but I really need to know that Can two statements have two different answers both are sufficient? Then what would be the final answer D or E

(1) Sufficient but answer is 27
(2) Sufficient but answer is 30

So, in this case I think the answer would be D. Isn't it?

[Ian Stewart]

It would make no logical sense to combine the statements if they gave contradictory answers, and since it needs to be possible to look at the statements together, they can't contradict each other. So no, you can never see a real GMAT question where the two statements are each sufficient alone and give different answers to the question.

That said, I've seen some dodgy prep company questions which don't obey this basic rule of DS question design, so you might run into the occasional question here that has incompatible statements. I'd advise ignoring those questions and looking at more representative material.