Question

Find the cost of painting the walls of a classroom having length,breadth and height as 20m,60m,10m respectively at the rate of ₹15/m²

Answer 1

firstly

LSA of cuboid is 2(l+b)*h

is formulae is 2(20+60)*10

20 aur 60 80 hue

2*80 160

to 160*10 1600 hue

ab aao cost pe to...

1600*15

16000ru. ho gya total OK bachche

Answer 2

Answer:

given ,

l=20

b=60

h=10 ...

we know...

CSA of cuboid=2(l+b)h

2×(60+20)×10

2×80×10

1600m'2

now,

cost of Painting /m'2=15

cost of painting 1600m'2=1600×15

=24000rs...

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