Balajikarthick1990
perse it looked easy..oh god...this was really tricky....mike can we get problems like this in actual GMAT...if yes, what would be the level?
Dear
Balajikarthick1990,
I'm happy to respond.

I like your avatar with the picture of
Srinivasa Ramanujam: he was one of the greatest mathematical geniuses of all time and I have tremendous respect for him.
Could you get a problem such as this on the GMAT? Yes. You see, all of math depends on precision, precision in the details. This applies to how one handles the numbers, but it also applies to each word of the text of the problem. In this problem, a very important detail was expressed verbally, in way that would usually convey only general conditions that most students tend to ignore. Never take anything for granted. Always be looking for any detail that can make a difference.
You see, sometimes in the business world, in a legal or contractual document, there could be one little detail that changes everything, perhaps even in the most unexpected place. The astute business man does not miss these details. That's why the GMAT would test detail management to this degree.
Hard to say the level of this. Many students are conscientious and pay attention to details, so I would estimate that a large percentage would get this right. This is not among the hardest questions on the test: in fact, when one notices the pertinent detail, the question is relatively straightforward.
Does all this make sense?
Mike