Choose a number between 61 and 107 that is a multiple of 3 , 9 and 12

Let us simply find the least common multiple of 3, 9, and 12.

3 / 3  9  12
3 / 1  3   4
4 / 1  1   4
   /  1  1  1

LCM = 3 * 3 * 4 = 36

Let us multiply 36 by 2 =  36*2 = 72

So 72 is a multiple of 3, 9 and 12 and it is in between 61 and 107.

The decimal expansion would be .27 repeated