The area of four walls of a room is 120 m2 The length of the room is twice its breadth If the height...........

Quantitative Aptitude (CDS) Mensuration 2D

The area of four walls of a room is 120 m2. The length of the room is twice its breadth. If the height of the room is 4 m, what is area of the floor ?

40 m²

50 m²

60 m²

80m²

छोटे Courses बड़े Results

Master Mensuration 2D

Prepare through Micro-courses

Try Now

Explanation:

Let breadth of room (b) = x m.
Length of room (l) = 2x m.
Given, height of room = 4 m.
According to question,
2h(l+b) = 120
=> 2×4(2x+x)=120
=> 3x =120 / 2×4=15
=> x = 153=5 m.
So, length of room =5×2=10 m.
Breadth of room =5 m.
Area of the floor =lxb
=10×5=50 m²
Hence option (2)