What is the sum of Population, when Markatal is greater than 48, when Inhabitants Per Km² is greater than 24, and when Municipality is Runavík?
CREATE TABLE "local_government_in_the_faroe_islands" (
  "municipality" text,
  "population" real,
  "inhabitants_per_km" real,
  "area_in_km" real,
  "markatal" real,
  "island" text,
  "region" text
);
SELECT SUM("population") FROM "local_government_in_the_faroe_islands" WHERE "markatal">48 AND "inhabitants_per_km">24 AND "municipality"='runavík';