text: 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_67 (fixtures INTEGER, round VARCHAR, clubs_involved VARCHAR)
  ### Question:
  In the sixth round, what is the sum of fixtures when there were more than 15 clubs involved?
  ### Answer:
  SELECT SUM(fixtures) FROM table_name_67 WHERE round = "sixth round" AND clubs_involved > 15