Freshman Test

While visiting Annapolis, a lady tourist noticed several students on their hands and knees assessing the courtyard with pencils and clipboards in hand.
“What are they doing?” she asked the tour guide.
“Each year,” he replied with a grin, “the upperclassmen ask the freshmen how many bricks it took to finish paving this courtyard.”
When they were out of earshot of the freshmen, the curious lady asked the guide: “So, what’s the answer?”
The guide replied: “One.”