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Strange Summation (Posted on 2017-05-04) Difficulty: 2 of 5
2$6=20
3$3=24
4$1=29
5$4=?

No Solution Yet Submitted by Ady TZIDON    
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solution Comment 1 of 1
7*2+6=20
7*3+3=24
7*4+1=29

so it would seem that
x$y=7x+y

if this is the case then we get
5$4=7*5+4=35+4=39

of course the issue with these kind of problems is that there are an infinite number of functions F(x,y) with which to define x$y such that the initial conditions are met.  Furthermore, for any given value Z we can find an F(x,y) such that the initial conditions are met and 5$4=Z so in that sense any answer is technically a valid answer.

  Posted by Daniel on 2017-05-04 08:37:45
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