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mental ability :
if 3+9 =31 , 15+12 = 45 , 18+9= 36 , than 12+25 is equal to
a = 94
b= 14
c=49
d= 53
e = 100

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Solution

if 3+9 =31 , 15+12 = 45 , 18+9= 36 , then 12+25 is equal to 94
so, the answer is a= 94.

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\begin{matrix} 5 & 3 & 10 & 20 & 25 & 11 & 13 & 7 & 12 & 31 19 & 10 & 12 & 17 & 18 & 11 & 32 & 17 & 16 & 2 7 & 9 & 7 & 8 & 3 & 5 & 12 & 15 & 18 & 3 12 & 14 & 2 & 9 & 6 & 15 & 15 & 7 & 6 & 12 \end{matrix}

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