The equilibrium constant does not have any units, it is just a pure number. Same technique as above, write the equilibrium expression and substitute into it. Sure enough, I have made an entry error somewhere in the problem. Underscoring my plea for carefulness is the difference between you and me in problem solving. You guys don't have that experience, so you don't have the feel.
M calculate the K eq .
I'm not going to write the set-up, but I want you to write it down on your paper. Then solve it. The answer is 48.4. This is the number one kid problem in solving these things - forgetting the exponent. The number two error is wanting to change the concentrations.