Question: how much torque is applied to a bolt when someone...

How much torque is applied to a bolt when someone pushes with 43 N of force 0.28 meters from the bolt?
A child weighing 375 N sits on a seesaw, and the downward torque he generates is 642 Nm. How far from the fulcrum (axis of rotation) must he be sitting to achieve exactly that torque?
. A man weighing 720 N is standing equally with both feet on a sheet of Styrofoam. Each shoe sole has an area of 180 cm². How much pressure results from just ONE foot on the Styrofoam below it?