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.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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