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    Question

    The area of four walls of a room is 144 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   => 144 = 2(l + l) × 4    => 144 = 4 × l × 4   => l = 144/16 = 9 cm   Area of the floor = l × b = 9 × 9 = 81 cm2 

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