You're not in a hurry and need to lose 20 lbs in a month? lol
Anyways, reduce diet 10-20% below maintenance and cardio 30 mins a day 6-7x a week (at least 300 calories burned). And you need go get a good amount of protein across the entie day too. That'll get drop you 6-7 lbs a month easy.
Just keep in mind the diet needs to be completely spot on for the above to work.
Maybe if you had given your stats we could give you more personalized advice.