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      Question

      The volume of a cube is 729 cm 3 . If the cost

      of painting the cube is Rs. 10 per cm 2 , then find the cost of painting five faces of the cube.
      A Rs. 4,860 Correct Answer Incorrect Answer
      B Rs. 4,250 Correct Answer Incorrect Answer
      C Rs. 4,150 Correct Answer Incorrect Answer
      D Rs. 4,400 Correct Answer Incorrect Answer
      E Rs. 4,050 Correct Answer Incorrect Answer

      Solution

      Let the length of the edge of the cube be ‘x’ cm.
      Volume of cube = x 3
      ATQ;
      729 = x 3
      Or, x = 9
      Area of five faces of the cube = 5x 2  = 5 × 9 × 9 = 405 cm 2
      Required cost = 405 × 10 = Rs. 4,050

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