Question

A road roller makes 200 rotations in covering 2200m.find the radius of the roller?

Answer 1

Let r be the radius of the road roller
then, n x circumference of the road roller = 2200 m
 => 200 x 2 # r = 2200 ..................................................... (assume # as pi)
 => r = 2200 /(200 x 2 #)
 => r = 11/2 x 7/22 .....................................................(# = 22/7)
 => r = 7/4 = 1.75 m

.: radius of the road roller = 1.75m