10
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My sister gave me a message today:

13.8  4.8   3     10.8  3     11.4
7.8   15    0     0     0     0
1.8   9     9     6.6   5.4   3

She's glaring at me with an evil eye. (My fault I decided to get her one anyway.)

I better figure this out quickly. What on earth does this say?

Note: She has sworn that the plaintext is not offensive, just incredibly boring.

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  • $\begingroup$ Any clue whether those non-integer numbers are exact or could be just rounded to 1 d.p.? If they're exact, multiplying everything by 5 could be involved. $\endgroup$ – Rand al'Thor Jun 6 '15 at 19:38
  • $\begingroup$ @randal'thor They are exact. You should not use any rounding. $\endgroup$ – mmking Jun 6 '15 at 19:39
  • $\begingroup$ Would something to do with an oboe make sense? $\endgroup$ – Rand al'Thor Jun 6 '15 at 19:47
  • $\begingroup$ @randal'thor Nothing to do with music. $\endgroup$ – mmking Jun 6 '15 at 19:48
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    $\begingroup$ Is the story part actually real? If yes, I definitely understand.... Argh... Sisters $\endgroup$ – AJL Jun 6 '15 at 20:22
6
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She's wondering

WHERES MY COOKIE

You get there by

dividing each number by 0.6 and using the result as index to the alphabet, e.g. 13.8 / 0.6 = 23 => W.

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  • $\begingroup$ Don't worry, I got her the cookie already :) $\endgroup$ – mmking Jun 8 '15 at 14:20

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