Previous Year Paper
CAT-2006-Previous Years Paper
The length, breadth and height of a room are in the ratio 3 : 2 : 1. If the breadth and height are halved and the length is doubled, then the total area of the four walls of the room will
|A||remain the same|
|B||decrease by 13.64%|
|C||decrease by 15%|
|D||decrease by 18.75%|
|E||decrease by 30%|
Area of 4 walls = 2 H(L + B)
Assume that the length, breadth and height of the room is 30 units, 20 units and 10 units.
Initial total area of the four walls = 2 × 10 (50) =
1000 sq. units
After the changes, new length = 60 units, new breadth = 10 units and height = 5 units
So, new total area of the four walls = 700 sq. units
So, area decreases by 30%.