Well that's a load of b.s. that's like saying to do one thing and then suddenly make up the rules so everyone gets it wrong, for instance if you said count all the small triangles, most people would get it correct, then if you counted the pixelated lines as very thin triangles mixed in with the others like I did then I'd be correct, but to people who don't know that puzzle there's no indication that your answer sheet is correct since the rules haven't been properly laid out for the question.
^ This kind of thinking is why I have a hard time passing tests

It kind of reminds me of when I tried applying for a QA testing job at a games company, I was talking to a guy outside and I didn't get very far but he got to this shitty section where there was a badly printed out screenshot of a game and it said "Find the bugs" of course, you wouldn't be able to find all of them because it was so badly printed and there was no criteria for what you were really looking for in the first place because they didn't classify what they meant as 'bug'.
Yeah, fuck tests lol

Also, if it's only subjective, then there can be no absolute correct answer, so asking it on a pass or fail basis is completely pointless, it's like putting grades on art.