Question

A swimming poll is 20 m length 15 m in breadth 9 m depth . find the cost of cementing its floor and walls at ₹ 35 per meter square

Answer 1

here is ur answer
lateral surface area of cuboid is 2(l+b)h
=2(20+15)9
=2(35)9
=630m^2
area of the floor(rectangle) =l*b
=20*15
=300m^2
total area=area of the walls+area of the floor
=630+300
=930m^2

now, cost cementing is Rs. 35 per m
total cost = 930*35
=Rs 32,550