Question

a swimming pool is 20 metre in length and breadth for metre in depth find the cost of cementing its floor and walls at
rupees 35 per metre square

Answer 1

l= 20 m

b= 15 m

h= 4 m

First we find the area of floor

=>20x15

=>300 m²

Then, we find area of walls

=>2(20x4) + 2(15x4)

=>2(80 + 60)

=>280 m²

Add both to get total area

=>300+280 = 580 m²

Multiply total area and cost per m²

=>580 x 12

=>Rs. 6960

Answer 2

A swimming pool is 20 m ...

Length of the swimming pool = 20 m

Breadth of the swimming pool = 15 m

Depth of the swimming pool = 4 m

Area of four walls = 2h(l + b)

= 2 x 4(20 + 15)

= 8x(35)

= 280 m2.

Area of the base = length x breadth

= 20 x 15

= 300 m2.

Total area of cementing = 280 + 300 = 580 m2.

Cost of cementing = Rs 35 per sq m

Total cost of cementing = 580 x 35 = Rs.20,300

hope it will help you