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Is this a real test question? That would help solve this word mystery. I read it as saying that there are two opposite sides that have an area of 40. JPV reads it as, "there are two pairs of opposite sides, each side with an area of 40".
The problem with that reading is that it would contradict number 1. It couldn't be true that from number 1 this figure has a pair of sides area 15, and a pair of sides area 24, and then from number 2 that it has two pairs of sides area 40 - we'd be talking about 8 sides all together.
In the GMAT, the two statements WILL NEVER contradict each other, because ultimately, they're talking about the same rectangular solid. So if this question comes from a real gmat book, or some other relyable source, I'd say it has to be C, and not B.
That, plus I still read the statement as saying that only 2 sides have an area of 40 each.
I also got C,
what I don't get is how would A be sufficient if we knew that we're talking about integers here?
areas of adjacent sides are 24 and 15, we can have:
A. 8 by 3 by 5 = total volume of 120
B. 24 by 1 by 15 = total volume of 360
hence A can't be enough even if we knew the numbers were integers