What Tries for has a Team of neath, and Points against larger than 109?
CREATE TABLE "pool_3" (
  "team" text,
  "tries_for" real,
  "tries_against" real,
  "try_diff" text,
  "points_for" real,
  "points_against" real,
  "points_diff" text
);
SELECT SUM("tries_for") FROM "pool_3" WHERE "team"='neath' AND "points_against">109;