user: Question: If there are 18 villages, what is the minimum area ?
Columns: ['Nr.', 'District', 'Former Name', 'Area ( ha )', 'Population (2005)', 'No. of villages', 'Density persons / ha']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'text']
Sample row: [1.0, 'Aiwo', 'Aiue', 100.0, 1092.0, 8.0, '10.9']
SQL:

assistant: SELECT MIN("Area ( ha )") FROM "Table" WHERE "No. of villages" = 18.0;