Total earnings, E=$(48+2x), assuming the two x's represent the same unknown amount given by two different customers to Friend 1,
Splitting the money evenly could mean they each get half: ½E=$(24+x).
So, they each receive 24+x dollars, if the differing numbers of customers each friend had is not significant. Between them they have 16 customers. The average fee per customer is (48+2x)/16=$(3+⅛x). Friend 1 has 6 customers so is entitled to 6(3+x/8)=18+¾x dollars, and Friend 2 is entitled to 10(3+x/8)=30+5x/4 dollars. That would be an even split based on how many jobs each friend did, so the differing numbers of customers each friend had is significant.