Leo: Given the sentence "A man cleaning the floor in an empty room." is it true that "A man is cleaning the floor."?
Mei: OK, So, let's think first...
Me:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The room must be empty if he is cleaning the floor.
Thus, the answer is yes.