Question

A roller 150 cm long has diameter of 70 cm. To level a ground it takes 750 revolutions. Determine the cost of levelling the playground at the rate of 75 paise per sq. metre.

Answer 1

Lateral surface area of roller=2*22/7*45*150=33m^2
Total area of playground=750*33=24750m^2
Total amount of money for levelling the playground=24750*.75/100=18562.5 Rupees

Answer 2

Answer:

Area of playground = 750 × CSA of roller

= 750 x 2 x 22x 35 x 150 =

7

750 x 33000 =

= 24750000 cm ^

=2 2475 m ^ 2

Cost of leveling

= 2475 x 0.75

Rs 1856.25