An inclined plane reduces the effort force by

Increasing the distance.

An inclined plane reduces the effort force by increasing the distance through which the force is applied.

Let us consider, work is the product of force and distance. And the Work on an inclined plane is defined as angle of force multiplied by distance. The angle may lies between sin or cos components. So the actual effort decreases and is less than the unity always.

Therefore, An inclined plane reduces the effort fort as well as work done.

the answer to this question is 60 n

see earlier