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_25391981_20 (episode VARCHAR, rating VARCHAR)
### Question:
For what episode was the rating/share for 18-49 at 2.8/8
### Answer:
SELECT episode FROM table_25391981_20 WHERE rating / SHARE(18 AS –49) = 2.8 / 8