Question

150 cylinders pillars of the Delhi Metro are to be cleaned if each pillars has a diameter of 84 cm and a height of 6 m find the cost of cleaning the pillars at a rate of 50 per m²

Answer 1

Answer:

Step-by-step explanation:

1cm = 1/100m

84cm = 84/100 = 0.84m

Radius = Diameter/2

=> 0.84/2 = 0.42m

CSA of cylinder = 2πrh

=> 2*22/7*0.42*6

=> 2*22*0.06*6

=> 15.84m²

Cost of cleaning 150 cylindrical pillars at Rs. 50 per m².

=> 15.84*150*50

=> Rs. 118800

Answer 2

The cost of cleaning the pillars at a rate of 50 per m² is Rs.118800

Step-by-step explanation:

Diameter of pillar = 84 cm

Radius of pillar =$\frac{84}{2}=42 cm$

100 cm = 1 m

Radius of pillar =0.42 m

Height of pillar = 6 m

Curved surface area of pillar =$2 \pi rh = 2 \times \frac{22}{7} \times 0.42 \times 6=15.84 m^2$

Curved surface area of 150 pillars= $150 \times 15.84=2376 m^2$

Cost of cleaning 1 sq.m. = Rs.50

Cost of cleaning 2376 sq.m. = $2376 \times 50=Rs.118800$

Hence the cost of cleaning the pillars at a rate of 50 per m² is Rs.118800

#Learn more:

21 cylindrical pillars of a building have to be cleaned. if the diameter of each pillar is 50 cm and the height is 4m, find the cost of cleaning them at the rate of Rs. 1.50 per m sq.?

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