Alice has $6 more than Betty. Betty has $10 more than Cindy. The total amount of money they have is $116. how much money does each of them have?

a=b+6

b=c+10
a+b+c = 116
so,
c+16 + c+10 + c = 116
3c = 90
c=30
so, (a,b,c) = (46,40,30)