It is a progression by threes: 12=0,15=1, so 18=2,21=3,24=4 and 27=5.
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27-12=15 -x-=+ 15/5=3 12- -3= +15 12+15=27 n= -3
12
3n = 15 + 12 = 27, 27/3 = 9 = n
122 !
2 3rds = 4/6 = 6/9 = 8/12 = 10/15 = 12/18 = 14/21 = 16/24 = 18/27 = 20/30