A uniform road AB of mass 6g is balanced horizontal about a knife edge at a distance of 3cm from end A where a mass of 8g is hanging .Find the length of the rod

Answer 1

balance ∑m*d on each side of the fulcrum
treat each part of the rod s a point mass located at 1/2 the length of that part from the fulcrum.

3*8 + (3/x * 6) * 3/2 = ((x-3)/x * 6) * (x-3)/2

Answer 2

Solution plz