i fount this puzle in a book :
there are 5 person's + 1 monkey
they shipwrek on a Island
the fisrst day they colect kokonut's
in the night happens this :
eats person goes to the pile
divides it in 5 hides 1/5
and gives 1 to the monkey
the 2e day
thay divide the remaining pile in 5
and give 1 to the monkey
now calc the size of every pile
if you got that :
how about a random number of person's and monkey's ?