CREATE TABLE table_13501 ("Rank" TEXT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

what is the average gold when rank is total and silver is more than 20?
SELECT AVG("Gold") FROM table_13501 WHERE "Rank" = 'total' AND "Silver" > '20'
SELECT AVG("Gold") FROM "table_13501" WHERE "Rank" = 'total' AND "Silver" > '20'