shashank.ism wrote:How is Bill related to Betty?

(1) Cindy, the wife of Bill's only brother Chris does not have any siblings.
(2) Betty is Cindy's brother in law's wife.

OA is C

From statement 1, we know that Cindy has no siblings and she is the wife of Bill's only brother Chris. However, this statement does not provide any information about Betty and is hence not sufficient to answer the question.

So, choice A and D are eliminated.

From statement 2, we know that Betty is Cindy's brother in law's wife. This statement establishes a relation between Cindy and Betty. This does not answer the question of how Bill is related to either Cindy or Betty. Hence, statement 2 alone is not sufficient to answer the question. Hence, we can eliminate choice (B).

Now, if we combine the two statements, we know that Bill and Cindy are related to each other through Chris, who is the only brother of Bill and that Cindy is Betty's brother in law's wife.

Cindy does not have any siblings and hence her brother in law has to necessarily be her husband's sibling. As Chris is the only brother of Bill, Cindy's brother in law has to be Bill and Betty is his wife.
[spoiler]
As we could answer the question by combining the information in the two statements, choice (C) is the correct answer.[/spoiler]

Is this a real GMAT question? It is not DATA efficiency, but rather VERBAL efficiency.

jackyork wrote:Is this a real GMAT question? It is not DATA efficiency, but rather VERBAL efficiency.

I learnt that it is Data Sufficiency, efficiency is must though. I have already come across this question, let me recollect!