>>John brought 5 bottles of beer, Bill brought 3 bottles, when I came. So, we drank this beer together and then I gave them $8 (all I had at this moment). How should they divide this sum?
>
>The obvious answer is $5 to John & $3 to Bill, but that must be wrong.
>
That's icorrect.

>Did Bill bring empty bottles, so John gets all $8 ?

No, they were not cheating :)