Question

A roller has a diameter of 0.5m and length of 1.5m .Find number of revolutions it has to make to cover an area of 264 sq m

Answer 1

n × πhd=264 me²,

n×22/7 ×1.5×0.5=264,

n=12×7/(1.5×0.5),

n=84/0.75,

n=8400/75,

n=84×4/3,

n=28×4=112 revolutions