Determine using graphical method of the mass of A and its angular position with respect to B

Question

         Four rotating masses A, B, C and D rotating in four different parallel planes are completely balanced. Angular position of masses C and D are 90° and 195° respectively from B in anticlockwise direction looking from right hand side. The rotating masses and their radius of mass centres are given below :

  m_b  = 25 kg     m_c = 40 kg       m_d = 35 kg

  r_b = 150 mm,   r_c = 100 mm, r_d = 180 mm

Planes B and C are 250mm apart and mass centre radius for mass A is 150 mm. Determine using graphical method:

(i)   the mass of A and its angular position with respect to B, and

(ii)  Position of planes A and D with respect to plane B.