Question

the swimming pool is 20 metre in length and 15 metre and breadth and 4 metre and depth find the cost of cementing its wall and floor @ rupees 5 per metre square also find the water required to fill the swimming pool completely ​

Answer 1

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

SA = 2h(l + b) + lb

= 2×4 (20 + 15) + 20×15

= 8 × 35 + 300

= 580 m²

For Rs. 5 per m²

Cost = SA × 5

= 580 × 5

= 2900

So, The cost of cementing its floor and walls at the rate of Rs. 5 per square metre is Rs 2900.

Answer 2

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