TopCat's blog post - Do the math

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 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 upset - I shall be back 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 Hotel Fiesta with Michael,
one of my students, who is also the assistant tennis coach. 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
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 home until sometime
tomorrow."