Finding the CG of a System with m1 & m2

[vscid]

If I have a body with mass m1, bolted to a body with mass m2, how do I find the CG of the entire system?
Thanks!

 

[HallsofIvy]

Find the CG of each separately, Then find the "weighted" average with each weighted by its mass. That is, using _x to mean "x-coordinate". CG_x= (m1CG1_x+ m2CG2_x)/(m1+ m2). The same is true for the y and z components.