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The length, breadth and height of the...

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 (a) decrease by 13.64%        (b) decrease by 15% (c) decrease by 18.75%          (d) decrease by 30%

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