What is the average number of likes for a tweet posted by a male user on Mondays?
male user refers to Gender = 'Male'; 'Monday' is the Weekday; average number of likes = Divide (Sum(Likes), Count(TweetID))
SELECT SUM(T1.Likes) / COUNT(T1.TweetID) FROM twitter AS T1 INNER JOIN user AS T2 ON T1.UserID = T2.UserID WHERE T2.Gender = 'Male' AND T1.Weekday = 'Monday'