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    Question

    A room measures 15 meters in length and 9 meters in

    breadth, with a maximum air volume of 540 cubic meters. Calculate the cost of painting the two largest walls of the room at a rate of ₹170 per square meter.
    A Rs. 19,040 Correct Answer Incorrect Answer
    B Rs. 20,040 Correct Answer Incorrect Answer
    C Rs. 24,310 Correct Answer Incorrect Answer
    D Rs. 18,360 Correct Answer Incorrect Answer

    Solution

    Height of the room = 540 ÷ (15 X 9) = 540 ÷ 135 = 4 metres So, area of largest side wall of the room = length X height = 15 X 4 = 60 m2 Area of both the largest walls of the room = 60 X 2 = 120 m2 So, cost of painting the side walls = 120 X 170 = Rs. 20400

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