Question

The area of 4 walls of a room is 210 m2. If the length of the room is twice
its breadth and the walls are 5 m high, find the area of the floor.
​

Answer 1

Answer:

Let Length=l,breath=b,height=h

Area of four walls = 2h(l+b) = 108m

2

h:l=2:5,h:b=4:5 (Given)

∴h:l:b=4:10:5

Let h=4x,l=10x,b=5x

Now, the area of four walls, 2×4x(15x)=108

x

2

=

120

108

Then the area of the floor is l×b=10x×5x=50x

2

=50×

120

108

=45m

2

Hence, option 'C' is correct.