To find the ratio of cars to airplanes, we compare the number of cars to the number of airplanes:
Number of cars: 12
Number of airplanes: 8
So, the ratio of cars to airplanes is 12:8.
To simplify the ratio, we find the greatest common divisor (GCD) of 12 and 8, which is 4. Then, we divide both numbers by 4:
12 ÷ 4 = 3
8 ÷ 4 = 2
Thus, the simplified ratio of cars to airplanes is 3:2.