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 (rating VARCHAR, episode VARCHAR)
### Question:
What is the rating/share for 18-49 for Week 6, Part 1?
### Answer:
SELECT rating / SHARE(18 AS –49) FROM table_25391981_20 WHERE episode = "Week 6, Part 1"