1940. Your drafts are: FWD 6'-01″, AFT 6'-05″. From past experience, you know that the vessel will increase her draft 1 inch for every 5 tons loaded. There is rig water on board and 15 tons of deck cargo. How many more tons of cargo can legally be loaded and still maintain the same trim

The correct answer is 10 tons. This limit is determined by the stability letter's deck cargo restriction when rig water is present, which allows for a maximum of 20 tons of deck cargo total. However, loading the full 20 tons would exceed the allowable forward draft, making 10 tons the maximum loadable amount while maintaining trim and adhering to all restrictions.