Question

To calculate the ideal mechanical advantage of a lever divide the input arm by the

Answer 1

To calculate the ideal mechanical advantage of a lever divide the input arm by the output arm. 
Mechanical advantage is the amount by which a machine can multiply an input force, calculated by dividing output Force in newtons by input force in newtons, while the ideal mechanical advantage is the mechanical advantage of a machine that has no friction, calculated by dividing the input distance by the output distance.