A pulley system consisting of four pulleys has efficiency as 90 percent . Calculate the mechanical advantage of the system Share with your friends Share 0 Debalina Deb answered this Dear student, no of pulley =velocity ratio (V.R.)=4efficiency (η)=90%=90100=910M.A.V.R.=η⇒M.A.=η×V.R.=910×4=3.6 Mechanical advantage =3.6 Regards 2 View Full Answer