Question

A swimming pool is 20m in length, 15m in breadth and 4m in depth. Find the cost of Painting its four walls at the rate of Rs. 20 per spuare metre.

Answer 1

Given length of swimming pool $=20$m

Breadth of swimming pool $=15$m

Height of swimming pool $=4$m

Curved surface area of cuboid $=2(l+b)h$

$=2[20+15]\times 4$

$=2\times 35\times 4$

CSA of cuboid (pool)$=280m^2$

If cost of painting is $=20$ Rs/sq. m

then cost of painting four walls of pool $=20\times 280$

Cost $=5600$Rs.

Hence cost of painting four walls of swimming pool is Rs. $5600$.