my question was answered wrong
posted by Lee .
In how many different ways can you arrange three 4x8 tiles to form a rectangle?

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http://www.jiskha.com/display.cgi?id=1304683575 
Unless my interpretation of the question is faulty, I stand by my previous answer.

I think it comes down to interpretation. Looking at the previous answer, it looks like that the tiles are assumed to be square.
If the tiles are 4x8 (i.e. rectangular tiles), we would be able to form two different rectangles by piling them in different directions (4*24 or 8*12).