user: Question: what is the premier when the rank is 30?
Columns: ['Rank:', 'Premier:', 'Party:', 'Assumed Office:', 'Left Office:', 'TOTAL Time in Office:']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Sir Robert Cosgrove', 'Labor', '18 December 1939', '18 December 1947', '18 years, 182 days']
SQL:

assistant: SELECT "Premier:" FROM "Table" WHERE "Rank:" = 30.0;