You will surely understand that I have certain needs that you, with your =
54 years, can no longer supply. I am very happy with you and I value you =
as a good wife. Therefore after reading this letter, I hope that you =
will not wrongly interpret the fact that I will be spending the evening =
with my 18 year old secretary at the Comfort Inn Hotel. Please don't be =
perturbed, I shall be back home before midnight."=

When the man came home, he found the following letter on the dining room =
table:

"My Dear Husband, I received your letter and thank you for your honesty. =
I would like to take this opportunity to remind you that you are also 54 =
years old. At the same time I would like to inform you that while you =
read this, I will be at the Hotel Fiesta with Michael my tennis coach, =
who, like your secretary, is also 18 years old. As a successful =
businessman and with your excellent knowledge of Math, you will =
understand that we are in the same situation, although with one small =
difference. 18 goes into 54 a lot more times than 54 goes into 18. =
Therefore, I will not be back before lunchtime tomorrow."