In a machine an effort of 10 kgf is applied to lift a load of 100 kgf. What is its mechanical advantage?

The mechanical advantage of a machine is 5. How much load it can exert for the effort of 2 kgf?

A lever of length 100 cm has effort of 15 kgf at a distance of 40 cm from the fulcrum at one end. What load can be applied at its other end?

In a lever, fulcrum is at one end at a distance of 30 cm from the load and effort is at the other end at a distance of 90 cm from the load. Find :

(a) the length of load arm,

(b) the length of effort arm, and

(c) the mechanical advantage of the lever.