CREATE TABLE table_39453 ("Team" TEXT, "Average" FLOAT, "Points" FLOAT, "Played" FLOAT, "1988-89" TEXT, "1989-90" TEXT, "1990-1991" FLOAT)

Which 1990-1991 is the average one that has Played of 38, and Points of 40?
SELECT AVG("1990-1991") FROM table_39453 WHERE "Played" = '38' AND "Points" = '40'
SELECT AVG("1990-1991") FROM "table_39453" WHERE "Played" = '38' AND "Points" = '40'