user: Question: How many were built with a locomotive number of 11-20?
Columns: ['Class', 'Wheels', 'Date', 'No. built', 'Loco Nos.']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['H1', '4-4-2', '1905-6', 5.0, '37-41']
SQL:

assistant: SELECT "No. built" FROM "Table" WHERE "Loco Nos." = '11-20';