user: Question: How many voters were in Manhattan when 181,639 people voted in the Bronx?
Columns: ['party', 'Manhattan', 'The Bronx', 'Brooklyn', 'Queens', 'Richmond [Staten Is.]', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Democratic', '308,944', '181,639', '358,945', '176,070', '30,517', 1056115.0]
SQL:

assistant: SELECT "Richmond [Staten Is.]" FROM "Table" WHERE "The Bronx" = '181,639';