Math-+POW

= ELEMENTARY BRAIN TEASER OF THE WEEK! =

Who Broke Mom's Favorite Vase?
CRASH! "Oh, no!" exclaims Andy. "We just broke Mom's favorite vase." Andy and his brothers, Bill, Carl, and David, were tossing a basketball in the living room when the ball slipped from one of the brother's fingers. Their younger sister, Elise, saw what happened and knows which brother broke the vase. When she hears the crash, their mom comes rushing into the room to see what happened. "My favorite vase," she sobs as she begins to pick up the many shards. "Who did this?" she asks. Andy says, "Bill did it."Bill says, "David did it."Carl says, "I didn't do it."David says, "Bill lied when he said that I did it." Their mom turns to Elise for the truth. Elise doesn't want to tattle, but tells her mom "Only one of the boys is telling the truth - the other three are lying."

Who broke the vase? Be sure to give a complete explanation of your reasoning.