So,there was 4 guys,3 of them put together 30 $ ,10 $ from each of them 3 , and they give it to the 4th guy and sent him to buy some beer,the beer costs 25 $ ,then the 4th guy came back and he gave to the other 3 guys a 1 $ to each of them 3 , and he left with 2 $,so it means that which of them 3 guys put 9 $ from each one,so 9+9+9 + 2 from the 4th guy equals 29 so where is one more dollar?)
sorry for my english,hope you got it all right)
sorry for my english,hope you got it all right)