I've trying to get ready for the CSWA test and hit a snag I can't get around. I made an assembly and the center of mass is suppose to be X=40.24 Y=24.33 Z=20.75. I can't seem to get it right no matter what I do, I'm sure someone has asked this before as it is a older sample problem. I attached the files and any insight on what I'm doing wrong and how to do it right will be greatly appreciated.