CREATE TABLE table_73856 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " TEXT, "Jockey" TEXT, "Winner/2nd" TEXT)

How man teams had a total weight of 57.5?
SELECT COUNT("Group") FROM table_73856 WHERE "Weight (kg)" = '57.5'
SELECT COUNT("Group") FROM "table_73856" WHERE "Weight (kg)" = '57.5'