Ms. Chu is in charge of the school music assembly. The assembly is 100 minutes
in length and contains music from 3
different ensembles. She would like less
than 13 minutes of "down time" during
the assembly, which includes the time it
takes the ensembles to get on and off the
stage. Each ensemble will have the same
whole-number amount of time, in minutes,
to perform. How many minutes should Ms.
Chu allow for each ensemble?