7982＋7983＝____

50072－3987＝____

    The bus stops at the next stop. A mother and her child get on the bus and sit down. The conductor comes to them for the tickets. The mother says. “One ticket to the Children's Park.” The conductor looks at the small child, then says to him, “How old are you, little boy?”

    The mother wants to speak, but the conductor stops her. The boy says, “Mother says I'm four years old at home and two on the bus. ”All the other people laugh.