After the = sign is written like Roman numbers 3 = 3 = III 4 = 15 = IV 6 = 51 = VI thus 8 = VIII = 53
53 is the answer 3=3=III 4=15=IV=15 6=51=VI=51
8=VIII=53
If 2,6=5 4,9=7 6,11=8 8,15=11 then 12,18=?