What is the average number of points for a difference of 55 and an against less than 47?
CREATE TABLE "campeonato_brasileiro_s_rie_a" (
  "position" real,
  "team" text,
  "points" real,
  "played" real,
  "drawn" real,
  "lost" real,
  "against" real,
  "difference" text
);
SELECT AVG("points") FROM "campeonato_brasileiro_s_rie_a" WHERE "difference"='55' AND "against"<47;