Question

    The ratio of length to breadth of a rectangle is 8:5.

    When the length and breadth of the rectangle is increased by 20% and decreased by 30% respectively, then its perimeter becomes 131 cm. Find the original area (in cm2) of the rectangle.
    A 1200 Correct Answer Incorrect Answer
    B 1500 Correct Answer Incorrect Answer
    C 1000 Correct Answer Incorrect Answer
    D 1700 Correct Answer Incorrect Answer

    Solution

    Let the original length and breadth of the rectangle be 8x cm and 5x cm, respectively According to the question, 2 × {(1.2 × 8x) + (0.7 × 5x)} = 131 Or, 9.6x + 3.5x = 65.5 Or, x = 65.5/13.1 = 5 Therefore, original area of the rectangle = 8x × 5x = 40x2 = 1000 cm2

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