If we assume 1$ a beer. If it is !.50 a beer, then you didn't pay enough. Hence the x in my answer.

>>>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?
>>
>>$7 for John, / $1 for Bill.
>
>And * for you :)