Instead of studying for the last exam of their college careers, four seniors spent the night partying in the house they had rentedoff campus. The next morning they waited until the test would bealmost finished, and then made their way to class. Along the way they all put grease on their hands to support the story they were going to tell their professor. The class was almost done with the exam, when all four seniors burst into the room. They report to the professor that they had a flat tyre along the way and could they please retake the test? The professor said that he was a reasonable man, so he scheduled a test date for 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, andthey were ready for anything. Each senior was placed alone in a separate classroom for the test. The first question, worth 5 points, was easy. The second question was worth 95 points, and it simply read, “Which tyre?”