Question

area of 4 wallroom is 120 m^2 . the length is twice the breadth. height is 4 m .find the surface area of the room

Answer 1

Answer:

Step-by-step explanation:

Let the breadth be (x) m

So the length=(2x)

Area of 4 walls = 120m^2

2(l+b)h= 120m^2

2 (2x +x)m*4m= 120m^2

(2 ×3x) m =30m^2

x= 30m^2 /6m

x=5m

So length = 10m

And breadth = 5m

Therefore the surface area of room

=2(lb+bh+hl)

=2(10*5+5*4+4*10)m^2

=2(50 + 20 + 40)m^2

=2*110m^2

=220m^2 (ans)

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