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_30 (silver INTEGER, rank VARCHAR)
### Question:
What is the sum of silver medals won for rank 7?
### Answer:
SELECT SUM(silver) FROM table_name_30 WHERE rank = "7"