Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is # Eng., when Outside Diameter, Main Passenger Deck is "inches (m)", and when Maximum Metric MTOW is "231.3 tons"?

### Inputs:
table_name: table, columns: ['Model', 'EIS -Final Prod. Year', '# Eng.', 'Maximum Metric MTOW', 'Outside Diameter, main passenger deck']

### Response:
SELECT # Eng. FROM table WHERE Outside Diameter, main passenger deck = inches (m) AND Maximum Metric MTOW = 231.3 tons