Do the math...
Subject: Fax from Husband
My Dear Wife,
You will surely understand that I have certain needs that you with your age and 54 year old body, can no longer supply. I am otherwise very happy with you and value you as a good wife.Therefore, after reading this fax, 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 home before midnight.
Your husband
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When the man came home, he found the following letter on the dining room table:
My dear husband,
I received your fax and thank you for being honest. 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 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 more times than 54 into 18.
Therefore, I will not be back before lunchtime tomorrow.
Your wife