SOLUTION: Pure acid is to be added to a 5% acid solution to obtain 95L if 80% solution. What amounts of each should be used?

Question 349169: Pure acid is to be added to a 5% acid solution to obtain 95L if 80% solution. What amounts of each should be used?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let liters = amount of pure acid to be added
Let liters = amount of 5% solution needed
In words:
(total liters of acid in final solution)/(total liters of final solution)
= 80%
----------------------
given:
(1)

(2)
Multiply both sides of (1) by and
subtract from (2)
(2)
(1)

75 liters of pure acid and 20 liters of 5% acid solution are needed
check answer:

OK

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