This is a puzzle posted on a social networking site that I have been trying hard since yesterday to solve:
My approach has been to find out a mathematical function with the numbers in the yellow, green and purple segments as its arguments and the number in the blue segment as its output. However, I have failed to find out any such function on the basis of intuition. Of course I can interpolate, but it is generally not the preferable method for solving puzzles. So could anybody please help?
I am also interested to know if there is an algorithm to solve these puzzles in a human-like manner rather than by using interpolation.