CREATE TABLE table_50718 ("Rank" FLOAT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

what is the average total when bronze is more than 0, gold is 0, the nation is united states (usa) and silver is 0?
SELECT AVG("Total") FROM table_50718 WHERE "Bronze" > '0' AND "Gold" = '0' AND "Nation" = 'united states (usa)' AND "Silver" < '0'
SELECT AVG("Total") FROM "table_50718" WHERE "Bronze" > '0' AND "Gold" = '0' AND "Nation" = 'united states (usa)' AND "Silver" < '0'