Normally, you learn during high school that when you take any exam, you should not reply with the best or smartest answer, but with the answer the teacher expects.
But that was the correct answer after all: screw the interview, have fun trolling the interviewers (you won't get the job anyway), then write a cool blog post and post it here. There is already someone in this thread asking for contact.
If you are interviewing for a job - the "answer the teacher expects" can tell you a lot about the company you are potentially going to work for, as can the exam which you are given to prove your worth.
What do you think they expected when they said not to use numbers? Is there a "normal" answer to that? It seems like a very freeform kind of crazy restriction to me.
The same applies to interviews.