What is the total (kg) when the snatch was 84, and bodyweight was less than 57.35?
CREATE TABLE "lightweight_58_kg" (
  "name" text,
  "bodyweight" real,
  "snatch" real,
  "clean_jerk" real,
  "total_kg" real
);
SELECT AVG("total_kg") FROM "lightweight_58_kg" WHERE "snatch"=84 AND "bodyweight"<57.35;