A town that has a population of 20,000 has 5000 telephones. If 400,000 calls are made in 1 month, what is the average number of calls per person?
I'm not seeing why you would have to post on a forum to get the answer.
The 5000 telephones are irrelevent and are probably just there to distract you.
The actual question is quite simple:
"If 400 000 phone calls are made by 20 000 people, how many phone calls did and average person make?"