How much weight could I lose with this plan?

If I eliminated soda (coke), sugary foods, and junk food and replaced it with water, fruits and veggies. Did a cardio workout about say 60 minutes 3 times a week. Took a one hour walk everyday. And ate about 1500 calories a day. How much wait do you think I will lose in about 3 months? I'm 15, 5'5'' and 210 pounds.