The expression \( 12:8 \) represents a ratio, which can be simplified. To simplify the ratio, divide both numbers by their greatest common divisor (GCD).
The GCD of 12 and 8 is 4.
So, dividing both by 4, we get:
\[ 12:8 = \frac{12}{4} : \frac{8}{4} = 3:2 \]
Therefore, the simplified ratio is \( 3:2 \).