If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Rotate and display numbered tile
Evened up (or not)
Solve a System of Linear Equations
Rule of mixtures (composites) - upper bound
Divisible by 16
Fill-a-pix - Solution Checker
Calculator spelling - Letters to Numbers
Cycling — Critical Power
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