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 C reverses into F (Posted on 2015-09-14)
AB° Celsius ≅ BA° Fahrenheit
2*CD° Celsius ≅ DC° Fahrenheit

How much is A+B+C+D?

Rem: XY denotes 10*X+Y

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 re(2): computer exploration ....... att ALL Comment 10 of 10 |
(In reply to re: computer exploration ....... att ALL by Ady TZIDON)

When reading the puzzle in the queue I also had forgotten the correct symbol for "approximately equal", having gotten used to the "~=" when a special symbol is too hard to place, such as in a comment like this.

I hardly ever give ratings to puzzles, and did not in this case. Ratings are even more subjective and amorphous than difficulty levels, and those are subjective enough. I would not have given the rating as a 1, as I was in fact intrigued by the approximation idea, and how to program for that. Having left the solution for after publication, I was left in a quandary as to which part-1 answer to use.

While some puzzles have explicitly stated no leading zeros, as a general rule I try (as I did in part 1) for solutions without leading zeros unless explicitly stated they're allowed, on the theory that a number such as 5 (the abstract number, not just the representation here) would never be considered a two-digit number, and the implication here was that each number was a 2-digit number. But when no other solution was available, I did mention it in part 2.

Edited on September 15, 2015, 7:54 am
 Posted by Charlie on 2015-09-15 07:51:08

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