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    Question

    Length and breadth of a rectangular room are in the

    ratio 4 ∶ 5. The perimeter of the room is 180 m. Cost of flooring is Rs. 75 per square metre. Find the cost of flooring the room.
    A Rs. 1,50,000 Correct Answer Incorrect Answer
    B Rs. 1,20,000 Correct Answer Incorrect Answer
    C Rs. 1,75,000 Correct Answer Incorrect Answer
    D Rs. 1,68,000 Correct Answer Incorrect Answer

    Solution

    Let the length and breadth of rectangular room is 4x and 5x respectively. ⇒  2 × (4x + 5x) = 180 ⇒  18x = 180 ⇒  x = 10 Area of floor = length × breadth ⇒  (4 × 10) × (5 × 10) ⇒  2000 m2 Cost of flooring = 2000 × 75 = Rs. 1,50,000

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