There were four seniors taking Microbiology and all of them had an 'A' so far. These four friends were so confident that the weekend before finals, they decided to visit some friends in Butte and have a big party. They had a great time but, after all the hearty partying, they slept all day Sunday and didn't make it back to Montana State University in Bozeman until early Monday morning.
Rather than taking the final then, they decided that after the final they would explain to their professor why they missed it. They said that they visited friends but on the way back they had a flat tire. As a result, they missed the final.
Professor Olesnicki agreed they could make up the final the next day. The guys were excited and relieved. They studied that night for the exam.
The next day Professor Olesnicki placed them in separate rooms and gave them a test booklet. They quickly answered the first problem worth 5 points. Cool, they thought! Each one, in a separate room, thought this was going to be easy ... then they turned the page...
On the second page was written...
For 95 points:
Which Tire? _________