Three Particles Are Placed in the Xy Plane

Multiple Choice

Three particles are placed in the xy plane.A 40-g particle is located at (3,4) m,and a 50-g particle is positioned at (-2,-6) m.Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?

A) (-1,-3) m
B) (-1,2) m
C) (-1,12) m
D) (-1,7) m
E) (-1,3) m