CREATE TABLE table_53729 ("Player" TEXT, "Car." FLOAT, "Yards" TEXT, "Avg." TEXT, "TD's" FLOAT, "Long" TEXT)

How many average carries for the player with 3 as a long?
SELECT AVG("Car.") FROM table_53729 WHERE "Long" = '3'
SELECT AVG("Car.") FROM "table_53729" WHERE "Long" = '3'