CREATE TABLE "table1_24027047_1" (
  "administrative_division" text,
  "area_km_2011" text,
  "population_2001_census_adjusted" real,
  "population_2011_census_adjusted" real,
  "population_density_km_2011" text
);

Question: What was the population density in km2 for 2011 in the division where area in km2 was 684.37 in 2011? 
SQL: SELECT "population_density_km_2011" FROM "table1_24027047_1" WHERE "area_km_2011"='684.37';

Question: What division had a population density of 8,552.4 km2 in 2011?
SQL: SELECT "administrative_division" FROM "table1_24027047_1" WHERE "population_density_km_2011"='8,552.4';

Question: What was the area in km2 in 2011 for the Narsingdi District?
SQL: SELECT "area_km_2011" FROM "table1_24027047_1" WHERE "administrative_division"='Narsingdi District';

Question: In what division was there a population density in km2 of 1,604.3 in 2011?
SQL: SELECT "administrative_division" FROM "table1_24027047_1" WHERE "population_density_km_2011"='1,604.3';

Question: In what division was there a population density in km2 of 4,491.8 in 2011? 
SQL: SELECT "administrative_division" FROM "table1_24027047_1" WHERE "population_density_km_2011"='4,491.8';