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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?

Correct Answer: 72

Explanation:

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

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