document.write( "Question 1013889: Pure acid is to be added to a 10% acid solution to obtain 90 L of a 20% acid solution.
\n" ); document.write( "What amounts of each should be used?
\n" ); document.write( "____ L of pure acid solution and ____ L of 10% acid solution.
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Algebra.Com's Answer #630189 by Alan3354(69443)\"\" \"About 
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Pure acid is to be added to a 10% acid solution to obtain 90 L of a 20% acid solution.
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\n" ); document.write( "t = 10%
\n" ); document.write( "h = 100%
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\n" ); document.write( "t + h = 90 (total solution)
\n" ); document.write( "10t + 100h = 90*20 (total acid)
\n" ); document.write( "Solve for t & h
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