How much would i lose if i did 15 mins of pilates and 15 mins on the elyptical everyday?

No one to tell. Depends on your body's metabolism and your diet. You would benefit from this for sure, but to get the most out of it- Eat healthy, work ALL of your body and do not stress your body to much over loosing weight. Once you start doing this, you will feel better, be able to do better and you will start loosing weight.