document.write( "Question 342922: How many quarts of water need to be added to 30 quarts of 40% alcohol to obtain a 20% alcohol solution? \n" ); document.write( "

Algebra.Com's Answer #245445 by Fombitz(32388) $\"\"$ $\"About$

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In order to halve the concentration, double the volume of water.
\n" ); document.write( "Add 30 quarts of water.
\n" ); document.write( "Algebraically, here's the concentration equation,
\n" ); document.write( "Let A be the amount of water added.
\n" ); document.write( "Water is a 0% alcohol solution.
\n" ); document.write( " $\"0%28A%29%2B40%2830%29=20%28A%2B30%29\"$
\n" ); document.write( " $\"1200=20A%2B600\"$
\n" ); document.write( " $\"20A=600\"$
\n" ); document.write( " $\"highlight%28A=30%29\"$ quarts \n" ); document.write( "

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