document.write( "Question 1095515: a 5 liter container is full of a 28 percent acid solution which needs to be diluted to a 20 percent acid solution. How much of the 28 percent must be drained off and replaced with distilled water?\r
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Algebra.Com's Answer #710032 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Let W be the volume to drain off from 5 liters acid solution.\r\n" );
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document.write( "Step 1:  Draining.  After draining,  you have 5-W liters of the 28% acid solution.\r\n" );
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document.write( "Step 2:  Replacing.  Then you add W liters of the distilled water (the replacing step).\r\n" );
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document.write( "                     After the replacing,  you have the same total liquid volume of 5 liters.\r\n" );
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document.write( "It contains 0.28(5-W) pure acid.\r\n" );
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document.write( "So, your \"concentration equation\" is\r\n" );
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document.write( " = 0.2.    (1)\r\n" );
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document.write( "The setup is done and completed.\r\n" );
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document.write( "Now you need to solve your basic equation  (1),  and since you didn't ask me to do it, I leave it to you.\r\n" );
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\n" ); document.write( "There is entire bunch of introductory lessons covering various types of mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - More Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Solving typical word problems on mixtures for solutions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on mixtures for antifreeze solutions (*)\r
\n" ); document.write( "\n" ); document.write( "    - Word problems on mixtures for alloys \r
\n" ); document.write( "\n" ); document.write( "    - Typical word problems on mixtures from the archive\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solution mixture word problems.
\n" ); document.write( "Specifically, for draining-replacing see the problems in the lesson marked (*) in the list.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook in the section \"Word problems\" under the topic \"Mixture problems\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I\r
\n" ); document.write( "\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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