Question

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 four walls of the room will

Answer 1

Answer:

Step-by-step explanation:

let initially ...lenght=6,breadth=4,height =2                                                                                   then total area =2(lh+bh)     =      2(12+8)   =40                                                                                finally lenght becomes double=12,  breadth becomes half=2 and height also becomes half =1.                                                                                                                                  now the total area is  ..again from 2(bh+lh)     2(2+13)=30.                                                  now %change in four walls of room =(final area -initial area )/(initial)*100=30 % decreases