Definitely, cardio helps burn fat and also switched up your diet. I'm not a doctor, but that's the general consensus, I think. Eat well and exercise. Also, I'd do some strength training periodically to make sure you don't lose muscle along with the fat.
Again, I'm no expert, but everything you read says about the same thing.
Just do a search on body fat percentage and you'll find the charts. Also, make sure not to confuse BMI with BF% - that can do you in sometimes and make you super confused.