Question

Find the cost of the paper for the walls of the room if each piece of paper is 40 cm wide and 60 cm long the room is 6 m long, 4 m wide, 3 m high and the cost of paper is * 1.40 per piece; allow 11 m for doors, etc., and assume that a whole number of pieces has to be bought. ​

Answer 1

Find area that needed to be covered by the wall paper:

Total area of the 4 walls = (6 + 4 + 6 + 4) x 3 = 60 cm²

Total area excluding the door = 60 - 11 = 49 m²

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Find area of each wall paper:

Area of wall paper = 0.4 x 0.6 = 0.24 m²

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Find number of pieces of wall papers:

Number of papers needed = 49 ÷ 0.24 = 204. 17 = 205 (round up be because it needs to buy whole piece)

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Find cost of paper needed:

1 piece of paper = rs 1.40

205 pieces = 1.40 x 205 = Rs 287

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Answer: The cost of wall papers is Rs 287

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