Are we sure that most, or even many adults are well-versed in things they were taught in school? My experience suggests otherwise. I would honestly struggle wit

Are we sure that most, or even many adults are well-versed in things they were taught in school? My experience suggests otherwise. I would honestly struggle with trigonometry or biology today, both subjects I excelled at in school. Funny enough, in my facebook feed today there are numerous people failing to answer "50+50-25*0+2+2" correctly.