What is the sum of area with a population of 5,615 and number more than 6?
CREATE TABLE "administrative_divisions" (
  "number" real,
  "name_of_administrative_unit" text,
  "telephone_052" text,
  "area_km_2" real,
  "population_people" real
);
SELECT SUM("area_km_2") FROM "administrative_divisions" WHERE "population_people"='5,615' AND "number">6;