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Depot officer: On the six routes where we posted a second conductor, ticketless travel for every hundred passengers is lower than on our other routes. Posting a second conductor therefore stops passengers travelling without a ticket. Checking inspector: Those six are the routes our monthly-pass holders use, and a pass holder is counted a passenger though he buys no ticket. Every passenger on those routes who does buy a ticket may be behaving exactly as he did before. The inspector answers the officer by

Competition practiceLogical / Critical
  • Ashowing that the route figures the officer relies on would look just as they do even if not one passenger had altered his behaviour
  • Bdenying that a second conductor was posted on the six routes
  • Cquestioning whether the depot's count of ticketless travellers is accurately kept
  • Dputting forward a course of action that the officer had not considered

Step-by-Step Solution

The officer's figure is ticketless travellers set against all passengers, and pass holders swell the second number without ever entering the first. Load six routes with pass holders and the fraction falls of itself, so the figure the officer treats as proof of changed behaviour is consistent with no change in anybody. The inspector does not deny the postings, does not say the count of ticketless travellers is inaccurate — he says it is being divided by the wrong thing — and he recommends nothing at all.
Answer: A) showing that the route figures the officer relies on would look just as they do even if not one passenger had altered his behaviour

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