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Question
The length, breadth and height of the room are in the ratio 3 : 2 : 1. The breadth and height of the room are halved and length of the room is doubled. The area of the four walls of the room will :
Options:
A .  decrease by 13.64%
B .  decrease by 15%
C .  decrease by 18.75%
D .  decrease by 30%
Answer: Option D

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