The length of a room is double of its breadth and breadth again double of its height. The cost of colouring the four walls at the rate of rupees 20 per square metre is rupees 2160. Find the cost of carpeting the room at the rate of rupees 325 per square metre.
Ans: Rs23400
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Let the breadth of the room be 'b' then the length of the room is 2b
Area of the cieling = l x b = 5000/25
=2b x b = 200
b^2 = 100
= b = 10m
therefore: l = 2b = 2 x 10 = 20 m
area of four walls = 64800/240 = 270m^2
= 2 x 1 x h + 2bh = 270
= 2 x 20 x h + 2 x 10 x h = 270
=60h = 270
h = 4.5 m
( i hope you got it :D )
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