Answer:
3/12
Explanation:
Because first off, you have to make 1/6 addable to 7/12. So multiply 1/6 by 2 and should get 2/12. Add the two together (2/12 + 7/12 = 9/12). Now, How much more needs to be added to make 12/12, 3/12. So I believe the answer is 3/12.