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It's basic math. Here is the thingy to make it easy to implement
A === B
C === D.
Now place X ANY where and the rule is : Multiply not diagonaly oposing numbers and dived by diagonaly oposed. I hope it makes it cleasr :
X == B
C == D
X = C*B/D
A == B
X == D
X = A*D /B
Edit. The whole machine learning works on that simple rule lol
Related Rants
Too much work kills your brain cells.
I could calculate the percentage of a value from a total set right from the top of my head. This includes large numbers like for example; finding the percentage of 1040 from 75000 = 1.377%, 344 from 5400 = 6.37% and so on...
But most times when I come across scenarios to apply such calculations on code I find myself googling for formulas and then I wonder; how am I able to come to a valid result when faced with similar challenge but could not recall or tell the formula my funny brain is deriving it's results from.
Maybe my brain isn't even using a formula. :/
So I guess because from pondering on how I arrived at results, I could tell I'm starting from an "if"...
Like:
If 25 of 100 = 25%
and 45 of 250 = 18%
Then 450 of 2400 will equal 18.7...%
Ask me what formula was used in the first "if" condition and I can't tell because that's common sense for me.
rant
brain cells
calculation