1 , 3, 9, 12 ,16

m and n are two different numbers from the list. m is a factor of 12 and $\displaystyle m = 4n $

Find m and n

i don't really understand how to do this question because if m is a factor of 12 than m could either equal 3 or 12. how are you suppose to know which one to choose?

can someone please go through it step by step for me ? thank you