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_20 (quantity VARCHAR, year_s__of_manufacture VARCHAR, class VARCHAR)
  ### Question:
  what is the quantity when the year of manufacture is 1900 and the class is mc?
  ### Answer:
  SELECT quantity FROM table_name_20 WHERE year_s__of_manufacture = "1900" AND class = "mc"