Confusing problem!

[YangyangY857]

[Deleted because this question is from a banned source - see below.]

[StaceyKoprince]

Please remember to read (and follow!) the forum guidelines before posting.

OG is a banned source; it is against copyright law to post OG questions anywhere on the web.

If you have access to our GMAT Navigator program, you can find explanations for many OG problems there. If you are in one of our classes, please ask OG questions during sections or before/after class. Finally, the forum archives contain some old OG posts that were made before the ban went into effect. You may find a discussion of your problem there (though it is no longer possible to add new posts.)

Finally, please remember that this folder is only for general strategy questions, not content or specific test problems. Check out the content / problem folders and post in the relevant folder depending upon the source of the problem you want to post (and make sure to follow the rules about banned sources).