Question

10. A swimming pool is 20 m in length: 15 m in breadth 4 m in depth. Find the cost of cementing its
floor and walls at RS 20 per m²
​

Answer 1

Answer:

Step-by-step explanation:

Floor area=20*15=300 sq.metre

Cost of cementing floor=300*20=Rs.6000

Lateral surface area=2(20*4)+2(15*4)=280 sq metre

Cost of cementing lateral area=280*20=Rs.5600

Total cost=6000+5600

=Rs.11600

Answer 2

Answer:

The cost of cementing its floor and walls is Rs 11,600

Step-by-step explanation:

Length of swimming pool (l) = 20 m

Breadth of swimming pool (b) = 15 m

Depth of swimming pool (height) (h) = 4 m

Rate of cementing = Rs 20 m²

★ Surface area of swimming pool = 2 h ( l + b)

⇒ 2 × 4 (20 + 15)

⇒ 8 × 35

⇒ 280 m²

★ Area of the floor = (l × b)

⇒ 20 × 15

⇒ 300 m²

★ Total area of cementing =

⇒ 280 + 300

⇒ 580 m²

★ Total cost of cementing the floor and the wall =

⇒ Cost of cementing × total area of cementing

⇒ 20 × 580

⇒ 11,600

Therefore,

The cost of cementing its floor and walls is Rs 11,600