Question

The lowest common multiple of two numbers is 36, one number is 12, what might the other number be?

Answer 1

The other number is 36 but if you are not counting 36, then it would be 18 but usually you would choose 36.
12*3=36
18*2
36*1=36
There are no other numbers above 12 other than 18 and 36 that has a multiple of 36

Answer 2

36       36             36          36               36                 36               36           36               36     36             36           36                 36