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A room is 8 m long, 4 m broad and 3 m high. If all the walls are to be covered with paper 80 cm wide, then the length of the paper is –1). 100 m2). 80 m3). 120 m4). 90 m |
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Answer» TOTAL surface area of the walls OFA room = 2 × ( LENGTH × height + breadth × height) Given,a room is 8 m long, 4 m broad and 3 m high ⇒ Total surface area of the given room = 2 × (24 + 12) = 72 m2 Let the length of paper be ‘x’ Given, breadth of paper is 80 cm. Area of paper = 0.8 × x sq. m. ∴ 0.8x = 72 ⇒ x = 90m |
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