[s1artibartfast]

The correct answer is obviously "insufficient information"

Maybe company 4 is the best, but I don't see why no information on weights implies equal weights.

Edit:

After thinking about this phenomenon for a while, I think there is an argument for testing implied or unstated prompts. It is frustrating to have to read minds, and quess what expectations are in different contexts. However, building a mental models of other people is an important skill.

I dont know that I would want to hire someone entirely incapable of it, who routinely required complete and explicit instruction.

That said, I dont think this kind of cognitive test is what they were going for