Couple's Funny Messages

Dear wife,

You must realize that you are 54 years old, and I have certain needs which you
are no longer able to satisfy. I am otherwise happy with you as a wife, and I
sincerely hope you will not be hurt or offended to learn that by the time you
receive this letter, I will be at the Grand Hotel with my 18 year old teaching
assistant. I'll be home before midnight.
Your Husband

When he arrived at the hotel, there was a faxed
letter waiting for him that read as follows:

Dear Husband,

You too are 54 years old, and by the time you receive this
letter, I will be at the Breakwater Hotel with the 18 year old pool boy.
Since you are a mathematician, you will appreciate that 18 goes into 54 more
times than 54 goes into 18.
Therefore don't wait up.
Your Wife