Gmat Question

GMAT Math question (function)?
I took a practice test on the GMAT CAT mba.com website. This was a question of mathematics: * m = x 3, where mm is odd * = 1 / 2 xm, when m is even 9 * x 6 * =? I thought the answer should be 81 [(9 x 3) x (1 / 2 x 6)], but was marked as "incorrect" and the correct answer is 27. Can anyone tell me how to get 27??
Well, I'll tell you ... I have the same thing. So either we're both wrong, or not practice test is correct. I see no way to score 27 .... both for the practice tests ...
Edit: Unless the goal is to solve for m if m *= 81 m = 27. 27 * is 3 x 27 if 27 is odd ... Right? But if m * = 1 / 2 XM? Then I could m = 162 .... Right? = 162 * 1 / 2 x 162 = 81 .... if 162 is still ... uh oh.
Math Rate / Speed Question
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