Question

6. A swimming pool is 20 m in length, 15 m
in breadth and 4 m in depth. Find the cost
of cementing its floor and walls @ 12 per
m?​

Answer 1

Answer:

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 m

2

For Rs.12 per square metre,

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

A=Rs580×12

A=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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Answer 2

Answer:

Step-by-step explanation:

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