2(15gal.)container of water, with their gross weight in pounds. One container weighs 122 lb and the other weighs 82 lb. The...

2(15gal.)container of water, with their gross weight in pounds. One container weighs 122 lb and the other weighs 82 lb. The container each weighs 2 lb when empty. One of the container is full. How many gallons of water are in both containers combined? # of gallons_______