CREATE TABLE table_57850 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

How many people were in the crowd at Lake Oval?
SELECT "Crowd" FROM table_57850 WHERE "Venue" = 'lake oval'
SELECT "Crowd" FROM "table_57850" WHERE "Venue" = 'lake oval'