Someone broke the gym window. There are 4 boys who are suspects. Tim, Tom, Dan and Don. The
principal says that he can tell when the boys are lying or telling the truth. As
you listen to the principal questioning the boys, you write down their answers.
Tim says, "It wasn't me." Tom says, "Dan did it." Dan says, "Tim did it." Don says,
"No he didn't." The principal turns to you and says, "One of these boys is telling
the truth. The other 3 are lying." Which boy is telling the truth? Who broke the gym window?