* If x and y are positive...

[mindadze]

[deleted because problem is from a banned source - see below]

OA is E.

OK, we can easily understand that none of the statements is SUFF by itself.

But combining them:
From 1: x=2y

From 2: x*y=2y*y=int*int
Here I see a problem, how is it possible to multiply a square of an integer by two (2y*y) and still get a square of an integer as a result? It is not possible, is it?

If it is not possible, does GMAT give such statements?
Moreover, statement 2 contradicts statement 1, and vise versa.

Please, your comments will be appreciated. Thanks.

[stud.jatt]

"From 2: x*y=2y*y=int*int
Here I see a problem, how is it possible to multiply a square of an integer by two (2y*y) and still get a square of an integer as a result? It is not possible, is it?"

You erred in assuming that x and y are integers. If it were so it would have been explicitly stated in the problem statement.

As for the equation 2y*y = int*int, we can have multiple values for y such as √2, √8, √32 and so on.

[deleted because problem is from a banned source - see below]

OA is E.

OK, we can easily understand that none of the statements is SUFF by itself.

But combining them:
From 1: x=2y

From 2: x*y=2y*y=int*int
Here I see a problem, how is it possible to multiply a square of an integer by two (2y*y) and still get a square of an integer as a result? It is not possible, is it?

If it is not possible, does GMAT give such statements?
Moreover, statement 2 contradicts statement 1, and vise versa.

Please, your comments will be appreciated. Thanks.

[RonPurewal]

stud.jatt has given a nice explanation of this problem.

however, i see an issue with the original post. namely, this:

If it is not possible, does GMAT give such statements?

is this problem actually from the OFFICIAL GMAT PREP software? this folder is restricted to problems from that software only. the wording of your question strongly suggests that this problem is not from that software. (if the question were from the gmat prep software, there would be no need to ask "does the gmat do this?" -- because the gmat prep software is written by the same people who write the actual test.)

so, please do the following:
* if this problem is from the official software, please post a screenshot;
* if this problem is not from the official software, please give the actual source of the problem, so that we can move this thread to the general math folder.

if you don't do either of these things in the next week, we will delete the thread. thanks.

[mindadze]

Thank you for your comments.

No this problem is not from GMAT-Prep software. It is from OG for GMAT Quantitative Review. Relevant folder was closed so I posted it here.

Sorry for inconveniences caused.

[tim]

OG is a banned source; it is illegal to post OG questions anywhere on the web. If you are in one of our classes, please ask OG questions during office hours or before/after class..

There's a reason the forum you refer to is closed. Please don't try to get around the rules by posting in inappropriate forums..

And please note that what Ron said is still very relevant: it makes no sense to ask whether the GMAT does something if you have an example of them doing it in a printed book published by the GMAT itself..