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I decided to write an email to some friends one day. Unfortunately, my evil brother applied a code to it. My friends called and asked what it was supposed to say, but I've forgotten what. Can you help me decode it?

24    16.5  34    34  41.5
16.5  59    16.5  49  66.5  41.5  39  16.5
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    $\begingroup$ This puzzle is not a good example of a question we'd like to see on this site. For more information please see this meta question: meta.puzzling.stackexchange.com/questions/1717/… . Perhaps some cleverly disguised clue to provide a definite starting direction would be enough to turn this into a good question. $\endgroup$ – CodeNewbie Jul 11 '15 at 18:43
  • $\begingroup$ @CodeNewbie I think it is easy enough to be solved without clues, but I will keep that in mind the next time. $\endgroup$ – Illyasviel Jul 11 '15 at 18:47
  • $\begingroup$ @CodeNewbie Although the encryption itself may be a bit random, there were disguised clues, such as 16.5 being repeated 4 times, the spacing, and the .5s. There were enough hints for me to solve it in a minute or two through various tools. $\endgroup$ – Quark Jul 11 '15 at 19:12
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The letter says:

Hello Everyone. By performing the transformation $(X-4)/2.5$ to each element and converting to letters (A=1, Z=26), you get Hello Everyone. I tried seeing if there's some significance to that transformation but I haven't been able to find any.

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  • $\begingroup$ You got it correct! There's not much significance to the transformation. I made it up myself. $\endgroup$ – Illyasviel Jul 11 '15 at 20:44

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