Question

mechanical advantage is the ratio of
efficiency is the ratio of expressed as a percentage.

Explanation:

Mechanical advantage compares the output force a machine provides to the input force applied to it, as it quantifies how much a machine amplifies force. Efficiency measures how well a machine converts input energy (or work) into useful output energy (or work), and this ratio is converted to a percentage to show the proportion of input that becomes useful output.

Answer:

Mechanical advantage is the ratio of output force to input force.
Efficiency is the ratio of useful work output to total work input expressed as a percentage.