12:3

It seems like you might be referring to the ratio 12:3. This ratio can be simplified by dividing both numbers by their greatest common divisor, which is 3 in this case:

12 ÷ 3 = 4
3 ÷ 3 = 1

So, the simplified ratio is 4:1.

If you meant something else or if you want to discuss a specific topic related to this ratio, please let me know!