SOLUTION: Pure acid is to be added to a 10% acid solution to obtain 90 L of a 20% acid solution. What amounts of each should be used? ____ L of pure acid solution and ____ L of 10% acid s

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Question 1013889: Pure acid is to be added to a 10% acid solution to obtain 90 L of a 20% acid solution.
What amounts of each should be used?
____ L of pure acid solution and ____ L of 10% acid solution.

Answer by Alan3354(69443) About Me  (Show Source):
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Pure acid is to be added to a 10% acid solution to obtain 90 L of a 20% acid solution.
What amounts of each should be used?
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t = 10%
h = 100%
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t + h = 90 (total solution)
10t + 100h = 90*20 (total acid)
Solve for t & h