As I recall, the force grows as the ratio of the areas of the pistons. That means, as the square of the diameter.
So, since 6 = 3*2, the force would be 3^2 * 20
Review your text on this subject. I'm sure there are examples. And you can always rely on google for lots of discussions on any topic.
An hydraulic press has an input cylinder of 2cm diameter and an output cylinder of 6cm diameter. Find the force exerted by the output piston when a force of 20N is applied to the input piston.
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