HOW CAN I LOSE 20-50 POUNDS IN 10 WEEKS? 10 POINTS?

I'm 5'6-5'7 , 216 pounds , 15 year old female ! how long should i workout and what should i eat? idc how unhealthy you say it is because being obese isn't healthy either. So if your gonna say something about the 1-2 pound weight loss, i DON'T want to here it & DON'T say cut off your arm or leg or whatever because I will report you okay? I just want mature answers, I'm tired of being the FAT girl, but I also DON'T want to be the anorexic girl, I just want to be at 150 or 160 again & Its for a wedding & NO I won't gain it back. I'm in sports now & we have to jog for a hour a day when school starts back okay thanks(: