Question

a swimming pool is 15 m in length, 12m in breadth and 2 m in depth . find the cost of cementing the floor and walls at the rate of Rs.15 per sq.m

is the ans correct in photo plz tell
and if not plz explain
and answer is not 4320.​

Answer 1

Answer:

actual area to be cemented =>

2 [ L*H + B*H + L*B ] - [ L*B ]

=> 2 [ 15*2 + 12*2 + 15*12 ] - [ 15*12 ]

=> 2 [ 30 + 24 + 180 ] - [ 180 ]

=> 2 [ 234 ] - [ 180 ]

=> 468 - 180

=> 288 m²

therefore cost of cementing = 288 * 15

=> Rs 4320

your answer is wrong as swimming pool will not have a cover at the top hence you can not take Total surface area.

instead from TSA subtract top surface area the correct answer is Rs 4320