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One of Thirty-six Poster

Age 5 to 7
Challenge Level
Hint Possible numbers
The number is odd 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35
The number is a multiple of three 3,9,15,21,27,33
It is smaller than 7x4 (=28) 3,9,15,21,27
The tens digit is even 21,27
It is the greater of the two possibilities 27 because that is greater than 21

So, the answer is 27