What's the total of Rank for the County of Galway and has a Total that's larger than 13?
CREATE TABLE "single_game" (
  "rank" real,
  "player" text,
  "county" text,
  "tally" text,
  "total" real,
  "opposition" text
);
SELECT SUM("rank") FROM "single_game" WHERE "county"='galway' AND "total">13;