Table: north_region
Columns: name
population_2009_estimate
largest_city
largest_metropolitan_area
number_of_states

Question: What is the 2009 estimate population of the Northeast?
SQL: SELECT "population_2009_estimate" FROM north_region WHERE "name" = 'northeast'

Question: What is the 2009 estimate population of the region with Manaus as the largest city?
SQL: SELECT "population_2009_estimate" FROM north_region WHERE "largest_city" = 'manaus'

Question: How many states has a 2009 estimate population of 27,3 million?
SQL: SELECT "number_of_states" FROM north_region WHERE "population_2009_estimate" = '27,3 million'

Question: What is the largest metropolitan area of the Central-West?
SQL: SELECT "largest_metropolitan_area" FROM north_region WHERE "name" = 'central-west'

Question: What is the 2009 estimate population of the region with Manaus as the largest city?
SQL: SELECT "population_2009_estimate" FROM north_region WHERE "largest_city" = 'manaus'