user: Question: How many ships for the nation with grand total of 20?
Columns: ['NATO member', 'Aircraft carriers', 'Battleships', 'Cruisers', 'Escorts', 'Submarines', 'Torpedo boat squadrons', 's Motor ship / s Naval trawler', 'Grand Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['United States', '6', '1', '3', '40', '9', '—', '—', 59.0]
SQL:

assistant: SELECT "s Motor ship / s Naval trawler" FROM "Table" WHERE "Grand Total" = 20.0;