Question

A swimming pool is 20 m long 15 m wide and 3 m deep. Find the cost of repairing the floor and wall at the rate of Rs. 25 per square metre.

Answer 1

Dimensions of swimming pool are = 20m × 15m ×3m

Where, Length = 20m , Breadth = 15m , Height = 3m

We know,

Area of floor = length × breadth

= 20 × 15

= 300 $m^2$

Area of walls of swimming pool = 2 (lh + bh) $c{m}^2$

= 2 (20×3 + 15×3)

= 2 (60 + 45)

= 2 (105)

= 210 $m^2$

Sum of areas of floor and four walls = area of floor + area of walls

= 300 + 210

= 510 $m^2$

Given, Cost for repairing 1 $m^2$ area = Rs 25

∴ Cost for repairing 510 $m^2$ = 510 × 25

= Rs 12750