Question

A swimming pool is 20m in lenght 15 m in bradth and 4 m in depth the cost of cementing its walls and floor at the rate of ruppes 5 per m ² also
the water required to fill the swimming pool completely ​

Answer 1

Answe]Given that,

Length of the swimming pool is, l = 20 m

Breadth of the swimming pool is, b = 15 m

Height of the swimming pool, h = 4 m

To find,

The cost of cementing its floor and walls at the rate of Rs.12 per square metre.

Solution,

The surface area of cuboid to be cemented is given by :

The surface area of the cuboid = area of 4 walls + area of floor

The surface area of the cuboid = Lateral surface area of cuboid + area of floor

The surface area of the cuboid is

\begin{gathered}2h(l+b)+lb\\\\=2\times 4\times (20+15)+20\times 15\\\\=580\ m^2\end{gathered}2h(l+b)+lb=2×4×(20+15)+20×15=580 m2

For Rs.12 per square metre,

\begin{gathered}A=\text{Rs} 580\times 12\\\\A=\text{Rs}\ 6960\end{gathered}A=Rs580×12A=Rs 6960

So, the cost of cementing its floor and walls at the rate of Rs.12 per square metre is Rs 6960.

Step-by-step explanation:

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