Use elimination and lots of trial and error to hone the right parts

Part of the trick is to use the process of elimination and lots of trial and error to hone in on the right pieces,and the more logic puzzles you solve,the better your intuition will be for when and where there's enough information to make your deductions.And did young Einstein really write this puzzle?Probably not. There's no evidence he did,and some of the brands mentioned are too recent.But the logic here is not so different from what you'd use to solve equations with multiple variables,even those describing the nature of the universe.