When I use math in secret, it is problems to figure out an average. If I eat 16 Hersey Kisses today, and I do this every other day for the entire week then I've eaten about 9 pieces of chocolate a day this week. I guess it's not a secret when I use math but I find myself sort of averaging things that I do out like that. If I want to buy a car that won't break down right away, I'll need maybe $8,000-$10,000, so that would be $278 a month that I'd need to save for three years. But there is no way I could make that much money until I get a real job that is not babysitting so I'd find a cheap, broken $2,000 car on Craigslist. That would be $167 a month for a year, and that is much more reasonable.
I don't really think about it that much, but I do this sort of math a lot. I'm not even sure if it has a name, but it helps me plan I guess, or see what I've eaten.

9%

My dad used to love the Tour de France, and he was a really good biker and triathlete. He'd explain to me that the bikers in the Tour de France would bike up hills and mountains with 9% incline sometimes! I understood how steep that was, and the bikers in the race still astound me that they can bike at such steep paces. He also explained to me that the steepest parts of the race was set up in mountain stages and they are the most difficult. There are four categories in the mountain stages and some that are beyond the categories that are 7% or more! Category 4 is shorter and easier than Category 3 climbs that are 5 kilometers and have a grade of 5%. Category 2 climbs are the same length or longer with an 8% grade while Category 1 climbs last 20 kilometers 6 percent grade. Beyond category climbs include an altitude difference of at least 1,000 meters and have an average grade of at least 7%.
We have some 9% inclines here in Albuquerque that are biked frequently such as Tramway to the Sandia Casino. On Saturdays I see people climbing up with their legs pumping, and I see others that coast down the street sometimes going upwards of 35 mph!