A woman who weighs 600 N sits on a chair with her feet on the floor and

Question:

A woman who weighs 600 N sits on a chair with her feet on the floor and her arms resting on the chair's armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25 N on her arms. The seat of the chair exerts an upward force of 500 N.
(a) What force does the floor exert on her feet?
(b) What force does the floor exert on the chair?
(c) Consider the woman and the chair to be a single system. Draw an FBD for this system that includes all of the external forces acting on it.