SOLUTION: HOW MUCH WATER MUST BE ADDED TO 20L OF A 10% SOLUTION OF A BORIC ACID TO REDUCE IT'S CONCENTRATION INTO A 4% SOLUTION?

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Question 205961: HOW MUCH WATER MUST BE ADDED TO 20L OF A 10% SOLUTION OF A BORIC ACID TO REDUCE IT'S CONCENTRATION INTO A 4% SOLUTION?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
HOW MUCH WATER MUST BE ADDED TO 20L OF A 10% SOLUTION OF A BORIC ACID TO REDUCE IT'S CONCENTRATION INTO A 4% SOLUTION?
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20 liters of 10% contains 2 l of acid
For 2 liters to be 4%, water must be 96%, 24 times as much, = 48 liters of water, 50 liters total.
Add 30 liters.
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btw, it's = it is.
"its concentration" is correct.