Answer: 
Step-by-step explanation:
Let be "x" the original volume of the solution (in milliliters) before the acid was added and "y" the volume of the solution (in milliliters) after the addition of the acid.
Set up a system of equations:

Applying the Substitution Method, you can substitute the second equation into the first equation and then solve for "x":
5 is the mean of variable a I might be wrong
C/30 = 8/12
c/30 = 2/3
3c = 60
c = 60/3
c = 20
The answer is 6/40. All the others equal 1/5.
Answer:
34
Step-by-step explanation:
5x+10=180
5x=170
x=34