Question

The room number of the a computer lab is a perfect

square. It is not even, but it is a multiple of 3. The
room number is either 25, 27, 36, or 81. Which one is
it?

Answer 1

81

Explanation:

25 and 27 are not perfect squares so they can not be the answer.

36 and 81 are both multiples of 3, but only 81 is not even, so the answer is 81