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.
Sum of series VII
Calculate area of sector
Sums of Multiple Pairs of Triangular Numbers
Calculate Amount of Cake Frosting
Temperature Conversion Utility (Strings)
Rule of mixtures (composites) - reverse engineering
Divisible by 8
Rumis Scorer 3
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