If 'A' is substituted by 1, 'B' by 2 and so on up to 'Z', which is substituted by 26, what will be the sum of the numbers substituted for the word 'PROBLEM'?
PÂ is substituted by 16
R is substituted by 18
O is substituted by 15
B is substituted by 2
L is substituted by 12
E is substituted by 5
M is substituted by 13
Sum of the numbers = 16+18+15+2+12+5+13
               = 81
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