I am 7.
Let n represent the number.
Add 47 to me.
47 + n
Multiply the sum by 3.
(47 + n)3
Divide the product by 2.
((47 + n)3) / 2
You end up with 81.
((47 + n)3) / 2 = 81
(47 + n)3 = 162
47 + n = 54
n = 7
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