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this only works if you know the year when the person was born. And if you do, why go with all the math hazzle if all you need to do is just substract the current year minus the year when person is born? this is stupid.

Given that ‘x’ is your shoe size, this “magic” reduces to the following; adjusted for the year 2014) —

20(5x+50) +1014 – year_of_birth = magic number

Well, let’s start with the most obvious “magic” – the terms 20(5x+50) +1014 are designed to give you a four-digit number always ending in the digits 14 (since 20(5x+50) always gives you a number that ends in 00). The smallest shoe size (1?), would give you the number 2114 from which you’d subtract your year of birth to amazingly(????) get your age with a 1 in front of it. Not so amazing, is it?

Knowing the above, it is easy to see that for each increase of “1” in shoe size the first two digits of the number represented by 20(5x+50)+1014 increases by 1

Shoe sizes and results via 20(5x+50) are listed below

Shoe size 1 yields 1100 (add 1014 to get 21134 subtract year_of_birth and you get the “magic”).

Shoe size 2 yields 1200 (add 1014 to get 2214, subtract year_of_birth and you get the “magic”).

Shoe size 3 yields 1300 (add 1014 to get 2314, subtract year_of_birth and you get the “magic”).

etc.

No “magic” folks, just math.

The “magic” does not work if you are over 99 years old. Sorry, centagenarians!

Next year (2015), this “magic” will work only when you replace 1014 with 1015.

What am I doing wrong? Shoe size 11, birth year 1950. =1163. Not supposed to work for shoe size over 9??

Your calculations are correct but since the question says the first digit is your shoe size hence I said it will not work for more than 9. But as you can see in my calculations X00 is the number which includes the shoe size to even if the shoe size is more than 9 the respective number of digits will give the solution.