Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_75 (bronze INTEGER, silver VARCHAR, gold VARCHAR, nation VARCHAR)
### Question:
what is the average bronze when gold is more than 0, the nation is greece and silver is less than 0?
### Answer:
SELECT AVG(bronze) FROM table_name_75 WHERE gold > 0 AND nation = "greece" AND silver < 0