document.write( "Question 825498: How much pure alcohol must be added to a mixture of 12 liters of alcohol and 30 liters of water to produce a 60% alcohol solution \n" ); document.write( "
Algebra.Com's Answer #497339 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "12/30 * 100 = 40% alcohol solution
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\n" ); document.write( "given:
\n" ); document.write( "42 L of 40% alcohol solution
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\n" ); document.write( "40*42 + 100x = 60(x + 42)
\n" ); document.write( "1680 + 100x = 60x + 2520
\n" ); document.write( "40x = 840
\n" ); document.write( "x = 840/40
\n" ); document.write( "x = 21
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\n" ); document.write( "answer:
\n" ); document.write( "add 21 liters of pure alcohol
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