Have you seen the riddle online about 66 books in the bible, subtracting your age, adding 50, and at the end you're suppose to get the year you were born? How does this work?

Write out the entire formula, where your age is X and the year you were born is Y, and then simplify it:

Y = (66 - X) + 50

It mathematically works right?  All you're really doing is subtracting your age from 2016 and then subtracting 1900 to get a two-digit "year."

Now this won't always work. If you're over 116 (for obvious reasons) or under 16; if you were six years old, for instance, this "formula" would return that you were born in 110. According to Reddit, it has nothing to do with the Bible, but math:

There's nothing special about this equation. It's just a bit of math that gives you the last two digits of your birth year in the 20th century, given the above assumptions, by subtracting your age from 116. It is not as universal as it appears. In 2017 that 66 number would have to be 67 or the 50 number 51. One or the other has to change in order for the equation to work with each new year."

So, this works because of Math.


 

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