Anyway, I don't think math is that important here. I remember a TED talk I saw about cooking. It was talking about the decline of cooking at home in US and how when when people (well, women specifically because traditionally they do most of the cooking) are not good at cooking kids start associating home made meals with bad food and eating out with tasty food. Where I'm from, 30 years ago eating out was not a thing. As a kid I didn't understand what restaurants are for ("I guess some people are traveling and can't cook?"). I know how to cook, all my friends know how to cook, their kids know how to cook. So when I'm reading about old lady using pre-made cookie mix and not knowing how to follow a basic recipe it tells me that culture of cooking died there long time ago. Math is a secondary issue here.