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_10 (number VARCHAR, name VARCHAR, builder VARCHAR, date VARCHAR)
  ### Question:
  What number has the builder ruston hornsby, the date 1961, and the name Topsy?
  ### Answer:
  SELECT COUNT(number) FROM table_name_10 WHERE builder = "ruston hornsby" AND date = 1961 AND name = "topsy"