A businessman sends an email to his wife. 'My Dear Wife, 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 email, I hope 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 e-mail 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 with your excellent knowledge of mathematics, 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 until lunchtime tomorrow. '