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CBSE Class 9 Answered

The length of a room is double its breadth. Its height is 3 m. The area of four walls excluding a door of dimensions 4 m 2 m is 100 m2. Find the volume.
Asked by Topperlearning User | 21 Feb, 2014, 02:30: PM
answered-by-expert Expert Answer

l = 2b, h = 3m

Area of four walls (including the door) = 100 + 8 = 108 m2

108 = 2(l + b)h

108 = 2(2b + b) 3

108 = 6(3b)

= 3b

18 = 3b

b = 6 m

l = 12 m

Volume = l b h = 12 6 3 = 216 m3

Answered by | 21 Feb, 2014, 04:30: PM

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