The volume of a cube is numerically equal to sum of its

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The volume of a cube is numerically equal to sum of its edges. What is the total surface area in square units ?

1. 12
2. 36
3. 72
4. 144

Correct Option: C

Let the edge of a square be x. and sum of its edges = 12 x
Now, by condition, x³ = 12x
⇒ x(x² - 12) = 0
⇒ Its total surface area = 6x² = 6(12) = 72 sq units