Question

A swimming pool is 20m in length,15m in breadth and 4m in depth. Find the cost of cementing its floor and walls at the rate of Rs.12 per square metre.

Answer 1

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Answer 2

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

$2h(l+b)+lb\\\\=2\times 4\times (20+15)+20\times 15\\\\=580\ m^2$

For Rs.12 per square metre,

$A=\text{Rs} 580\times 12\\\\A=\text{Rs}\ 6960$

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