I'll avoid the mathematical debate so as not to embarrass any of the
participants. ;-)

My shop has me and Fred. I'm 61 and Fred is 86. So, the answer is 147
divided by two, unless you consider Midnight, the resident watchdog who is
42 in dog years, and that would really send the equation into absolute
values of subsets.

We pay our staff with beer and Alpo. Fred and I get the beer because
Midnight gets mean when she drinks. She gets the Alpo. Fatso, the cat, is
not on the clock, and keeps no regular hours, so she has to settle for mice.
And she sneaks a little beer and Alpo here and there.

Steve