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_1566852_7 (interview_subject VARCHAR)
### Question:
HOW MANY TIMES WAS LUDACRIS THE INTERVIEW SUBJECT FOR THE 20 QUESTIONS COLUMN?
### Answer:
SELECT COUNT(20 AS _questions) FROM table_1566852_7 WHERE interview_subject = "Ludacris"