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_25721_3 (total_viewers VARCHAR, airdate VARCHAR)
### Question:
How many episodes aired on 25 october 2012?
### Answer:
SELECT COUNT(total_viewers) FROM table_25721_3 WHERE airdate = "25 October 2012"