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More info would be nice but if you mean what is the fraction that indicates 12 of 15 it would be 4/5 ? of 15 as 4/5 * 15 = 60/5 or 12 & 5/5 * 15 = 75/5 or 15
mean = 4.
If you mean: 5 = 2x+15 then x = -5
The mean is 3.