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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%



Question ID - 50058 | SaraNextGen Top Answer

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%

1 Answer
127 votes
Answer Key / Explanation : (d) -

Length = breadth = height =

 

Area of 4 walls =

 

New length = new breadth =  new height =.

 

New area of the 4 walls =

 

Decrease in area =

 

Decrease % =

127 votes


127