The word increase means the problem is addition: 15 + x = 27. Reorder the problem so that it is subtraction: 27 - 15 = x and solve for x. X = 12.
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27*27 = 729
4 + 15 = 19 + 8 + = 27 (alterative)
27-12=15 -x-=+ 15/5=3 12- -3= +15 12+15=27 n= -3
It is: 3*3*3 = 27
3n = 15 + 12 = 27, 27/3 = 9 = n