One day, Ella comes into the classroom. She sees Mike and Lily arguing. "I'm right," says Mike. "No. I'm right!" shouts Lily. They almost begin to fight. "What's the matter?"asks Ella. "It's about this maths problem." says Lily. "Let me see. Well, Mike's right, and Lily, you're right too. Only in different ways," says Ella. "I think both of you should know all roads lead to Rome."