A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The mechanical advantage of the lifting machine is A. 15 B. 18 C. 20 D. 26

The mechanical advantage of a machine is the ratio of the force it exerts to the force applied to it. In this case, the force exerted by the machine is 500 kg, and the force applied is 25 kg. Therefore, the mechanical advantage is 500/25 = 20.

The other options are incorrect because they do not represent the correct ratio of the force exerted by the machine to the force applied to it.