user: Question: What is # Eng., when Outside Diameter, Main Passenger Deck is "inches (m)", and when Maximum Metric MTOW is "231.3 tons"?
Columns: ['Model', 'EIS -Final Prod. Year', '# Eng.', 'Maximum Metric MTOW', 'Outside Diameter, main passenger deck']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Airbus A300', '1974–2007', 2.0, '132.0 tons 171.7 tons', 'inches (m)']
SQL:

assistant: SELECT "# Eng." FROM "Table" WHERE "Outside Diameter, main passenger deck" = 'inches (m)' AND "Maximum Metric MTOW" = '231.3 tons';