This is a pretty simple problem, I am just a bit confused. Consider a 10m-long homogeneous ladder of mass M that leans in equilibrium against a vertical frictionless wall. Identify the forces acting on the ladder and evaluate their magnitude (relative to the weight W=Mg). I can't draw the diagram. However, the length of the base subtended by the ladder to the wall is 6m, and so the height is 8m. The equation given for sum of torques is 3Mg - F8, where F is the force of the normal at the wall. Where abouts would the fulcrum be? Maybe then i can understand this equation.