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Because each different force has different a different advantage.
Mechanical advantage the resistance force. Mechanical advantage is equal output force divided by input force.
Efficiency of a machine or mechanical advantage
The ratio of resistance force to effort force is a mechanical advantage.
mechanical advantage= output force over input force
The main function is the transfer of force from one point to another. Some pneumatic machines also obtain mechanical advantage by converting a small force applied over a large distance to a large force applied over a small distance.
The answer is mechanical advantage, not efficiency!
The mechanical advantage is 5.Mechanical Advantage = Output Force/Input Force
A lever is a very useful tool that lets us exchange weight for distance. For example (theoretically) if you had to move a 200 pound sack into a car, but couldn't lift it, you could divide it into 8 parts, each being 25 pounds, and move each one individually into the car. It would be easy, however it would take more distance (lifting into the car 8 times instead of 1)
Mechanical Advantage
mecanical advantage
Whatever output force is required, you can divide it by the "mechanical advantage" to calculate the input force.