Question

"A force if 75 N is applied to a smaller piston, resulting in an upward force from a larger piston of 825 N. What is the ratio of the area of the larger piston to the area of the smaller piston?"

This is a physics question relating to Pascal's Principle, so I think I need to use the formula P = f/a. But I'm confused as to how I go about solving this problem.

Any help would be greatly appreciated!