A husband wrote the following letter for his wife and left it on the dining room table:

'To My Dear Wife,

You will surely understand that I have certain needs that you, being 54 years old, can no longer satisfy. I am very happy with you & 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 upset - I shall be home before midnight.'

When the man came home late that night, he found the following letter on the dining room table:

'My Dear Husband,

I received your letter and thank you for your honesty about my being 54 years old. I would like to take this opportunity to remind you that you are also 54 years old. As you know, I am a math teacher at our local college. I would like to inform you that while you read this, I will be at the Marriot Hotel with Michael, one of my students, who is also on the tennis team. He is young, virile, and like your secretary, is 18 years old.

As a successful businessman who has an excellent knowledge of Math, you will understand although it may appear that we are in the same situation, there is one mathematical difference: 18 goes into 54
a lot more times than 54 goes into 18.

Therefore, I will not be home until sometime tomorrow.'