your explanation is the only one I understand because of your disclaimer that dealing with percentages, is dealing with average values. If you don't know that then the question is confusing but if u do it's like any other average question. Thanks!

Hi, I also have the same question as everyone above

I never understand these explanations. In fact I feel like they make me more confused than before I started the question. For a lot of them he just skips over answer choices or briefly says some thing like “it’s obvious why this is wrong” but if it was so obvious wouldn’t we all be getting 180?

I hate when I get a question wrong because of a silly mistake with my conditional chain. I made the invalid inference PS ←s→ A and chose C. But, I definitely see how that was wrong now.