How many draws were there when there were 30 tries against?
CREATE TABLE "2010_2011_table" (
  "club" text,
  "played" text,
  "won" text,
  "drawn" text,
  "lost" text,
  "points_for" text,
  "points_against" text,
  "tries_for" text,
  "tries_against" text,
  "try_bonus" text,
  "losing_bonus" text,
  "points" text
);
SELECT "drawn" FROM "2010_2011_table" WHERE "tries_against"='30';