CREATE TABLE table_name_75 (bronze INT, silver VARCHAR, gold VARCHAR, nation VARCHAR)

what is the average bronze when gold is more than 0, the nation is greece and silver is less than 0?
SELECT AVG(bronze) FROM table_name_75 WHERE gold > 0 AND nation = "greece" AND silver < 0
SELECT AVG("bronze") FROM "table_name_75" WHERE "gold" > 0 AND "greece" = "nation" AND "silver" < 0