SOLUTION: System of equations: A laboratory assistant is asked to mix 30% alcohol solution with 21 liters of an 80% alcohol solutuion to make a 60% alcohol solution. How many liters of th

Question 226451: System of equations:
A laboratory assistant is asked to mix 30% alcohol solution with 21 liters of an 80% alcohol solutuion to make a 60% alcohol solution. How many liters of the the 30% alcohol solution should be used.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 30% solution to be used
In words:
(liters of alcohol I end up with)/(total liters at end) = 60%
given:
I am adding liters of alcohol to solution
The solution already contains liters alcohol
I can now write the equation

14 liters of the 30% solution must be added
check:

OK
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