user: Question: How many villages have a density persons/ha of 5.5?
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 SUM("No. of villages") FROM "Table" WHERE "Density persons / ha" = '5.5';