Question

the diameter of a roller is 120 cm and its length is 84 CM the roller Max 500 complete revolutions in pressing the ground once find the expenditure of pressing the ground @ 75 paise per square metre​

Answer 1

Answer:

FIRST WE FIND THE C.S.A OF ROLLER

that is : 2πrh

So: 2*22/7*60*42

15840cm.sq.

Area covered in one revolution = 15840cm.sq.

Area covered in 500 revolution = 500*15840=7920000cm.sq.

7920000cm.sq.=792m.sq.

Cost of pressing 1m.sq. ground = 75 paise

Cost of pressing 792m.sq.=75*792=59400paise

59400paise=594ruppess