Question

A godown is 50m long,40m broad and 10m high.Find the cost of whitewashing its four walls and ceiling at ₹20 per square metre.

Answer 1

Length = 50m .
Breadth = 40m .
Height = 10m .

Area to be white washed = 2(bh+lh)+lb
= 2( 40*10 + 50* 10) + 50 * 40

= 2 ( 400 + 500) + 2000

= 1800 +2000

= 3800 m²

Cost of white washing = 3800 * 20 = 76000Rupees .

Answer 2

Hey...

Ans :- length of that godown = 50m
width of that godown = 40m
the height = 10m

lateral surface area of a cuboid = 2h (l+b) 
= 2 (10){50 + 40}
= 20 ( 90)
= 1800m^2

area of the celling = length × breadth
= 50 × 40
= 200m^2

total area to be whitewashed = total lateral area + area of the celling
= 1800 + 200
=2000m^2


cost of whitewash per m^2 = Rs. 20
total cost = total area to be whitewashed × ckst of whitewashing per m^2
= 2000 × 20
= 40,000

So, the total cost will be Rs. 40,000