If you take any number, double it, add 10, divide by 2, and subtract your original number, the answer will always be 5.
Try it and it is pretty cool! This is a good one to share with the family!
Another fun fact:
On average women speak 7000 words per day, where as men speak just over 2000
This is good to know--by the time my husband comes home he is out of words and I am just getting started!