Shoes size

Shoes size


Take your calculator, or your pencil

Put on your shoe size (no half size)
multiplie by 5,
add 50,
multiplie the total by 20,
adds (current year - 1000),
subtract the year of your birth.

Now you have a number with 3 or 4 digits (depending on the size standard used, either on 1 or 2 digits)

The first/the first ones give(s) you your shoe size,
The last 2 give you your age !!!

Friends mathematicians, thank you for explaining me the trick!