Question

a swimming pool is 20m in length 50 m in breadth and 4 m in depth find the cost of cementing its floor and walls at the rate of rs12 per square metre

Answer 1

✨${\pink{hello!!!}}$✨

Given:-
L=20m
B=50m
H=4m

Cost of cementing it's floor and war at rate of rs 12 per m² would be
=area in m²×12

Area=CSA of cuboid+Area of floor
CSA=2(l+b)h
=2(20+50)4
=8×70
=560m²

Area of floor=l×b
=20×50
=1000m²

So the Total area to be cemented would be
=560+1000m²
${\green{=1560m^2}}$

And cost of cementing would be:-
Cost=1560×12
${\red{Cost=18720/-}}$

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