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_1847180_3 (vacator VARCHAR, date_of_successors_formal_installation VARCHAR)
  ### Question:
  Who vacated his post when his successor was formally installed on May 11, 1966?
  ### Answer:
  SELECT vacator FROM table_1847180_3 WHERE date_of_successors_formal_installation = "May 11, 1966"