SOLUTION: How many liters of pure acid must be mixed with 14 liters of 20% acid solution to get a 30% mixture?

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Question 300479: How many liters of pure acid must be mixed with 14 liters of 20% acid solution to get a 30% mixture?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let L be the liters of pure acid.
100%2AL%2B20%2814%29=30%28L%2B14%29
100L%2B280=30L%2B420
70L=140
L=2
2 liters of pure acid added to 14 liters of 20% solution will yield 16 liters of 30% solution.