The length, breadth and height of a room are in the ratio 3:2:1. If the breadth and height are halved, while the length is doubled. Then the total area of the 4 walls of the room will be decreased by Choose one.
A) 33  B) 30  C) 88  D) 22  E) 11
Given l:b:h=3:2:1   let h=10, b = 20, and l = 30   area = 2(l+b)h2(l+b)h   area= 2*(3x+2x)*x = 2(30+20)10=10002(30+20)10=1000   Now after those adjustments in the measurements,   l=60, b=10, h=5   area= 2(l+b)h2(l+b)h = 2(60+10)5=7002(60+10)5=700   Percentage decrease= 1000−7001000×1000=30%   Answer:30
<result>B</result>
The length, breadth and height of a room are in the ratio 3:2:1. If the breadth and height are halved, while the length is doubled. Then the total area of the 4 walls of the room will be decreased by