Which Density per km² is the lowest one that has a Number (map) smaller than 13, and an Area in km² of 11.1?
CREATE TABLE "list_of_montreal_boroughs" (
  "number_map" real,
  "borough" text,
  "population_canada_2011_census" real,
  "area_in_km" real,
  "density_per_km" real
);
SELECT MIN("density_per_km") FROM "list_of_montreal_boroughs" WHERE "number_map"<13 AND "area_in_km"=11.1;