To lift a crate, a pulley system exerts a force of 2,750 newtons. Find the mechanical advantage of the pulley system if the input force is 250 newtons.

You just divide the 2,750 onto 250N and you'll get 11.

For a single pulley system, you would just divide how much force the pulley system uses, in this case 2,750 newtons; by how much input force which is 250 newtons for this problem.

So, 2750/250 = 11.

Therefore, your mechanical advantage would be 11.