Question

A pool is 20m long 15m broad and 4m deep. Find the cost of cementing its floor and its walls at the rate of Rs 12 per square meter

Answer 1

This is your answer

Answer 2

Answer:

The cost of cementing its floor and its walls at the rate of Rs 12 per square meter is 3360 rupees.

Step-by-step explanation:

Given,a pool is 20m long 15m broad and 4m deep.

So, length of the pool = 20 m.

and breadth of the pool = 15 m.

and depth of the pool = 4 m.

It is clear that the pool is a cuboid.

We know, surface area of a rectangle = 2×(length+breadth)×depth

For example,if length of a cuboid is 10 cm and breadth is 5 cm and depth is 2 cm then surface area of the cuboid

$= 2 \times (10 + 5) \times 2 \\ = 2 \times 15 \times 2 \\ = 60 \: {cm}^{2}$

According to question,

Surface area of the pool = Area of tha wall =

$2 \times (20 + 15) \times 4 \\ = 2 \times 35 \times 4 \\ = 280 \: {m}^{2}$

It is given that,

Cost of cementing of 1 square meter wall is 12 rupees.

By Unitary method, cost of of cementing of 280 square meter wall is $(12 ×280) =3360\: rupees$

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