CREATE TABLE table_34231 ("Player" TEXT, "Rec." FLOAT, "Yards" FLOAT, "Avg." FLOAT, "Long" FLOAT)

What is Darrius Heyward-Bey's average with more than 20 yards and less than 80 long?
SELECT COUNT("Avg.") FROM table_34231 WHERE "Yards" > '20' AND "Player" = 'darrius heyward-bey' AND "Long" < '80'
SELECT COUNT("Avg.") FROM "table_34231" WHERE "Long" < '80' AND "Player" = 'darrius heyward-bey' AND "Yards" > '20'