The class was almost done with the exam when all four seniors burst into class. They told the professor that they had had a flat tire along the way, and could they please retake the test? The professor said that he was a reasonable man, so he scheduled a testing date the following week.
Their plan had worked! They studied diligently for the next week, making the most of their time. The day of the make-up came, and they were ready for anything.
The first question, worth 5 points, was easy. The second question was worth 95 points. It simply read, "Which tire?"