What will be the Area of the Floor? if

The area of four walls of a room is 120 m sq. and the length is twice the breadth. If the height of the room is 4 metres, then find the area of the floor.

  1. 100 m2
  2. 50 m
  3. 75 m2
  4. 80 m
Desire Adnan Default Asked on 3rd August 2015 in Maths.
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1 Answer(s)

Answer: (2) 50 m square
Explanation:
Let the length of the room is l m , breadth is b  & height is h.
According to the question,
l = 2 b  & height = 4 m
Formula-
Area of the four wall = 2 (l + b)  x h
Where, l = length , b = breadth  & h = height.

The area of the four walls  = 120 m   (Given in the question)
2 ( l + b) x h = 120
2 (2 b + b ) x 4 = 120
8 x 3 b = 120
24 b = 120
b = 120/24
b = 5 m
Then, l = 2 b = 2 x 5 = 10 m
Formula-
Area of the floor = l x b 
Then, Area of the floor = 5 x 10
= 50 m square.
Hence, the area of the floor is 50 m square.

Anurag Mishra Professor Answered on 4th August 2015.
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