Question

the diameter of a roller 120 cm long is 84 CM if it takes 500 complete Revolution to level a playground determine the cost of levelling at rupees 25 per metre square​

Answer 1

Answer:

Rs. 23100

Step-by-step explanation:

Number Revolutions = Area of ground/Curved surface area of the roller

500 = x/π*d*h

where, 500 = revolutions

x = area of ground

h = height = 120 cm = 1.2 m

d = 84 cm = diameter = 0.84 m

π = 22/7 = value of pi

∴ x = π*h*d*500 = 22/7×1.2×0.84×500

= 60×15.4 = 924 m²

∵ Area of the ground = 924 m²

Cost per m² = Rs. 25

Total cost = 25×924 = Rs. 23100

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