CREATE TABLE table_77795 ("Player" CLOB, "Club" CLOB, "League" FLOAT, "Play-offs" FLOAT, "FA Cup" FLOAT, "FA Trophy" FLOAT, "Total" FLOAT)

What is the mean number of play-offs when the league number was bigger than 18, where the player was John Grant and the total number was bigger than 25?
SELECT AVG("Play-offs") FROM table_77795 WHERE "League" > '18' AND "Player" = 'john grant' AND "Total" > '25'
SELECT AVG("Play-offs") FROM "table_77795" WHERE "League" > '18' AND "Player" = 'john grant' AND "Total" > '25'