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_42 (silver INTEGER, rank VARCHAR, bronze VARCHAR)
### Question:
What is the average Silver with rank 30 and a Bronze greater than 0
### Answer:
SELECT AVG(silver) FROM table_name_42 WHERE rank = "30" AND bronze > 0