What is the sum of the losses by the Montreal Hockey Club, who have more than 15 Goals Against?
CREATE TABLE "final_standing" (
  "team" text,
  "games_played" real,
  "wins" real,
  "losses" real,
  "ties" real,
  "goals_for" real,
  "goals_against" real
);
SELECT SUM("losses") FROM "final_standing" WHERE "team"='montreal hockey club' AND "goals_against">15;