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_50 (sio_2 INTEGER, na_2_o VARCHAR, k_2_o VARCHAR, fe_2_o_3 VARCHAR)
  ### Question:
  What is the highest SiO 2, when K 2 O is greater than 0.16, when Fe 2 O 3 is greater than 0.16, and when Na 2 O is less than 7.53?
  ### Answer:
  SELECT MAX(sio_2) FROM table_name_50 WHERE k_2_o > 0.16 AND fe_2_o_3 > 0.16 AND na_2_o < 7.53