Question

the diameter of a roller 1 m long is 70 cm if it takes 200 Evolutions to level a playground find the cost of levelling at the rate of 75 paise per square metre

Answer 1

CSA of a cylinder = 2π rh
=2×22÷7×50×70
=44×500
=22,000cm^2
=220m^2
area of the playground = 200×220
=44000m^2.

cost of leveling = 75p× 44000m^2
= 3300000paise
=33000Rs








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Answer 2

first find curved surface area that touches the ground and then multiply it by the rate