Probability change

Suppose i have a set [A,B,C]
Probability of A =10% B=40% C=50%
If probability of C lowers to 25%, how the remainder value is distributed(proportionaly)?
I know it suppose to get like 15(+50%),60(+50%),25 but what if the set grows?
exmaple       5,77,3,15(-5) becomes 6.65,102,4,10
I'm looking for a formula for arbitrary sets of probability(not just 3).

>>8
I use something like val1,val2,val3 where val1+val2 give probability to val3(manually adjusted).
The problem is, without understanding how actually "val1+val2 give probability to val3", like, what happens in reality, your way of just adding them, then doing meaningless math tricks to get probability back to normal, is practically guaranteed to make no sense and yield weird results. When you say that it's easier to understand, I'm not sure you understand what "understand" is supposed to mean...

What are you trying to do?