Professor Plump put a 23.5-pound weight on one side of a scaleand balanced it with 3 items on the other side. He had these itemsto choose from: a 4.5-pound rock, a 1.5-pound chunk of cheese, a3-pound pumpkin, a 10-pound cat, a 6-pound book, and a 9-pound clock. What 3 items balanced the scale?