Question

The dimensions of a room are 8m , 6m and 5m . Find the cost of white washing is it's 4 walls at the rate of ₹80 per square meter

Answer 1

area of all 4 walls =l*h=8*5*4=40*4=160m.sq

therefore cost of whitewashing 4 walls =160*80=12800rupees

I hope it helps you

Answer 2

Answer:

The cost of white washing four walls of a room is ₹$11200$.

Step-by-step explanation:

Given the dimensions of a room as $8m,6m$ and $5m$.

We need to find the cost of white washing its four walls.

The cost of white washing per square meter is ₹$80$.

Let us find the area of these four walls first.

On seeing the dimensions, we can assume the room is in the shape of a cuboid.

Length, l = 8m

Breadth, b = 6m

Height, h = 5m

Surface area of a cuboid, $A=2lb+2lh+2bh$.

But we can ignore the area of top and bottom surfaces.

Area of a top surface = lb

Area of a bottom surface = lb

So, area of four walls = 2lb+2lh+2bh-lb-lb

$A=2lh+2bh$

$A=2(8)(5)+2(6)(5)\\A=80+60\\A=140$

Area of four walls = $140m^2$.

Cost of white washing 140 sq. mtr is = $140\times 80 =11200$.

So, the cost of white washing four walls of a room is ₹$11200$.