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

### Instruction:
How many villages have a density persons/ha of 5.5?

### Inputs:
table_name: table, columns: ['Nr.', 'District', 'Former Name', 'Area ( ha )', 'Population (2005)', 'No. of villages', 'Density persons / ha']

### Response:
SELECT COUNT No. of villages FROM table WHERE Density persons / ha = 5.5