Divide by 6...
Yes you can reduce a ratio. Here's an example: If you have a pole that is 14 feet tall and a man who is 6 feet tall then the ratio of the height of the man to the pole is 6:14. You can reduce 6:14 because 2 can go into both, so it is reduced to 3:7.
9/6
A 9 to 5 ratio.
The ratio is 2 to 9 in its simplest form
6 / 10.8 = 5 / 9
The simplest form of the ratio 6:8 is 3:4
54/9 = 6
Divide both by 9: 27/36 = (3*9)/(4*9) = 3/4
6:3
9:6 6:4
If you mean in the ratio of 2 to 3 then it is 6 to 9