This is a variation on the problem of 2 people trying to split something. [where A cuts and B chooses which half].
One solution that solves this problem, but can be used for any practical value of N peopleSpoiler for
Not sure that this is what TSLF is aiming at. I think he means "How do you divide a round cake equally into 5ths using 4 cuts". But I've been known to be wrong before...
Edit... or more specifically, how do you ensure that each of 5 people gets an equal amount.
Ahh k-man, where were you when we needed a modicum of common sense? You're THE man.
Oh and, BTW, I did so inform y'all thusly.