If you could select a number different from 24 to represent the number of hours in a day what number would you choose?

10, or 100. The decimal system would make many calculations much simpler. Of course, the hour would also have to be divided into decimal minutes (10 or 100), and each minute in decimal seconds (10 or 100). Or simply indicate fractions of a day, such as "I'll see you in 10 milli-days" (about a quarter hour, according to the current system).