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    • Question

      The volume of a cube is 343 cm³. If the cost of painting

      the cube is Rs. 9 per cm², then find the cost of painting five faces of the cube.
      A Rs 2250 Correct Answer Incorrect Answer
      B Rs 2100 Correct Answer Incorrect Answer
      C Rs 1995 Correct Answer Incorrect Answer
      D Rs 2025 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the length of the edge of the cube be ‘x’ cm.
      Volume of cube = x³
      ATQ;
      343 = x³
      Or, x = 7
      Area of five faces of the cube = 5x² = 5 × 7 × 7 = 245 cm²
      Required cost = 245 × 9 = Rs. 2,205

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