Question

When three professors are seated in a restaurant, the hostess asks them: "Does
everyone want coffee?” The first professor says: “I do not know." The second
professor then says: “I do not know.” Finally, the third professor says: “No, not
everyone wants coffee.” The hostess comes back and gives coffee to the professors
who want it. How did she figure out who wanted coffee (10)​

Answer 1

Answer:

the third professor has ordered coffee.