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    Question

    A rectangular hall is 12 m long and 9 m wide. A carpet

    is laid leaving a uniform border of 1 m all around the inside. Find the area of the border.
    A 72 m² Correct Answer Incorrect Answer
    B 42 m² Correct Answer Incorrect Answer
    C 38 m² Correct Answer Incorrect Answer
    D 63 m² Correct Answer Incorrect Answer

    Solution

    Outer area = 12 × 9 = 108 m² Inner length = 12 − 2×1 = 10 m Inner width = 9 − 2×1 = 7 m Inner area = 10 × 7 = 70 m² Area of border = 108 − 70 = 38 m² Answer: 38 m²

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