Physics Rotational Mechanics Level: Misc Level

Three point mass particles are located in a plane;3. 61 kg located at the origin, 5. 8121 kg at [(6.72 cm); (13.44 cm)], and 1. 7328 kg at [(18.2112 cm); (0 cm)].How far is the center of mass of the three particles from the origin?Answer in units of cm.