Question

The area of the four walls in a room is 120 m^2. The length is twice the breadth.If the height of the room is 4 m,find the area of the floor

Answer 1

Let breadth be x m
So, length = 2x m

So, 2*4*(2x+x) = 120
or, 3x = 15
or, x = 5

So, area of floor = 5*(2*5)m2 = 50m2

Answer 2

lsa= 120
b = x
l=2x
h=4

2 (l+b)h = 120
2 (x+2x)=120
6x+4=120
6x = 120-4
6x= 116
x= 19.3
b= 19.3
l= 2×19.3=38.6

area of floor= l×b
19.3 × 38.6 = 744.98m^