What is the sum of 105 not including one

Matteo makes raspberry punch. the table shows how many parts ginger ale and raspberry juice to use for a batch. raspberry punch parts ginger ale 2 parts raspberry juice 3 matteo decides to add one part of raspberry juice. what is the new ratio of ginger ale to raspberry juice?

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

How do you find the distance of each number from the mean