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    • Question

      A cube is painted from the outside for Rs. 6,912. If the

      painting cost is Rs.8 per m², determine the volume of the cube.
      A 1152 cm³ Correct Answer Incorrect Answer
      B 1728 cm³ Correct Answer Incorrect Answer
      C 1062 cm³ Correct Answer Incorrect Answer
      D 1242 cm³ Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total surface area of the cube = (6912 ÷ 8) = 864 m²

      Surface area of a cube = 6a²

      (Where, ‘a’ is the length of each edge of the cube)

      6a² = 864

      ⇒ a² = 144

      ⇒ a = 12 metres

      Volume of the cube = a³ = (12)³ = 1728 cm³

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