Poster

One of thirty-six

 
This poster is based on the problem One of Thirty-six.
 

The poster is available as a PDF, or the image below can be clicked on to enlarge it.

 

Image
One Of Thirty-Six Poster

 

 

Canonical solution
HintPossible numbers
The number is odd1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35
The number is a multiple of three3,9,15,21,27,33
It is smaller than 7x4 (=28)3,9,15,21,27
The tens digit is even21,27
It is the greater of the two possibilities27 because that is greater than 21

So, the answer is 27