A father has left 47 donkeys for you to distribute to his three sons;
1/2 (23.5) should go to his eldest son,
1/3 (15.667) to the middle one, and
1/8 (5.875) to the youngest.

You arrive with your own donkeys.
You can add or take some donkeys from the herd.

How do you divide them so that all sons are happy with your decision?
How many donkeys does the eldest son get?

Inspired by Malba Tahan “The man who counted.”