How can u lose 5-10 pounds in a week?

You can't . You can't loose 5 to 10 lbs of weight in a healthy way with out damaging your body. In order to burn i lb of fat you have to burn by exercise 3500 cal . Now you calculate , eat healthy diet , cut calories , go to gym on regular basis , you feel better , look healthy , and will loose weight in months not in one week.