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_65 (number_of_fixtures INTEGER, round VARCHAR)
### Question:
What is the sum of Number of fixtures when the rounds shows quarter-finals?
### Answer:
SELECT SUM(number_of_fixtures) FROM table_name_65 WHERE round = "quarter-finals"