Question 1092351
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The record  A:B:C = 10:12:15 means, by definition, that there is a quantity x such that A = 10x, B = 12x, C = 15x,

and this quantity "x" is called  "<U>a common measure</U>".


So, in our case, that means that the common measure is 220 Hz = 10x; hence, x = {{{220/10}}} = 22 Hz.


Then other two notes are 12*22 = 264 Hz  and  15*22 = 330 Hz.
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Math and Music have a common base: harmony.