Age 54 Maths

A math teacher and his wife were both 54 years old. One evening the wife came home and found a note from her husband. It said: ''My dear, you are 54 years old and there are some things you are not giving me, so I am at the Holiday Inn with my 18-year-old student. Don't bother waiting up for me.''

He returns home that night to find a note from his wife: ''You are also 54 years old and there are things I need that you're not giving me. So I am at the Motel 6 with one of your 18-year-old students and you (being a math teacher) should know that 18 goes into 54 way more than 54 goes into 18, so don't YOU wait up for ME.''