Posted by hamza on Monday, November 23, 2009 at 7:07pm.
Let the tens digit be x. Then the hundreds digit is 2x. The sum of these two digits is 3x, and that has to be less than 9, so x must be less than 3 - that is, the tens digit must be 1 or 2.
So we might have:
42U or 21U
where U is the Units digit.
The digits add to 9, so it has to be
423 or 216
But we are told that the answer is odd, and only one of those is odd...
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