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      Question

      The area of four walls of a room is 160 cm2.

      If the length and breadth of the room were equal and the height of the room is 5 cm, then what is the area of the floor?
      A 64 sq.cm Correct Answer Incorrect Answer
      B 49 sq.cm Correct Answer Incorrect Answer
      C 36 sq.cm Correct Answer Incorrect Answer
      D 81 sq.cm Correct Answer Incorrect Answer

      Solution

      According to question, => l = b Area of the wall = 2(l + b)h => 160 = 2(l + l) × 5 => 160 = 4 × l × 5 => l = 160/20 = 8 cm Area of the floor = l × b = 8 × 8 = 64 cm2

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