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The length of the room doubles its breadth. It's height is . The area of 4 walls excluding a door of dimensions is . Its volume is:

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answer is C.

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Detailed Solution

Concept:
Given is that:
Length of room doubles its breadth.
Assuming breadth of room as '

Then the length will be: '2y'

Area of 4 walls excluding door area

Area of door

Therefore,
Area of walls including door area

Since, Area of walls including door

(length +breadth) height
So,2( length + breadth ) height

Therefore,
breath of room

Length of room

So,The volume of room will be = Length

Breadth

Height

Hence, the correct option is 3 .

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