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      Question

      The area of four walls of a room is 112 cm2.

      If the length and breadth of the room were equal and the height of the room is 4 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
      E None of these Correct Answer Incorrect Answer

      Solution

      According to question,   => l = b   Area of the wall = 2(l + b)h   => 112 = 2(l + l) × 4    => 112 = 4 × l × 4   => l = 112/16 = 7 cm   Area of the floor = l × b = 7 × 7 = 49 cm2 

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