I can understand wanting to see how someone responds to a question they can’t answer (or couldn’t answer immediately), but the problem is when PHBs get their hands on these questions and assume there is a “right” answer, or turn the question into a D&D session. Why make it so random? Make it a more esoteric problem…

I hate these kind of “questions”. Most interviewers probably don’t even have a general idea of what a good “response” would be (my smart-ass answer would be: “At least ten”, and then if there’s a pregnant pause I would show myself out) but present them as some sort of “deep insight” possibility.