How many pulleys needed to lift 300 lbs?

The number of pulleys needed to lift 300 lbs depends on the desired mechanical advantage. A simple pulley system can provide a 2:1 mechanical advantage, meaning you would need two pulleys to effectively lift the weight with half the force. However, if you want to lift the 300 lbs with a lighter force, you can add more pulleys to increase the mechanical advantage, but this will also require more rope length. Ultimately, the exact number of pulleys will depend on the configuration and the amount of force you can exert.