1. 150 students of a hostel have food enough for 45 days. 25 students leave the hoster after 10 days. How much longer will the remaining food last? 2. In a hostel. 120 student has provisions for 60 days. After 20 days some student were added to hostel, the provisoion has finished 10 days a head. How many student were added. 3. Some soldier of a barrack have provision for 30 days. After 10 days 60 soldier left barrack. Then the provision lasted for 10 more days. How many soldier were there in beginning?