We are 3 friends, decided to start a milkshake business, it was suggested by one of us (Mr. Z), and we agreed from the start to devide the job as following:
- me & Mr. Z pay the money for the whole business, half/half or aound that
- The 3rd friend (Mr. A), will do all the job by himself without paying anything
Then we decided to devide the benefits equally betwen us ...

Then the following happened :
- Mr. Z helped us on some occasions for 1 month, then he travelled out of countrey, although we are still working since 3 months and still there is more ahead
- Mr. A needed my help all the time, so I worked with him most of the days, I even did interviews for the employees
- I payed all the money for the business ( around 50.000 $ ), as Mr. Z travelled and he needed money so he didn't give me, although after some time he told me he can give me around 3000 - 4000 $ only

- So in summery : I payed the whole business money and worked too much with Mr. A and get exhusted mentally and physically

My Question is : How to devide benifits between us FAIRLY ???

Thank you all ...