Living in Basel, I need to learn German. Today, I can proudly announce a 210-day German learning streak on DuoLingo (a language learning App). That's 210/365 of a whole year! Applause accepted. Now 210/365 can be simplified to a not very simple 42/73, but my question is:
In how many days could my efforts be simplified to a fraction where both numerator and denominator are single digits?
First solved in Switzerland by Dimitrios, aged 11
First solved in the US by Olympia, aged 10