document.write( "Question 535257: How much water must be added to 12 L of a 40% solution of alcohol to obtain a 30% solution?
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Algebra.Com's Answer #351848 by KMST(5328) $\"\"$ $\"About$

You can put this solution on YOUR website!
I will pretend that I am not a chemist, because from the point of view of a chemist, this problem is so wrong on multiple levels that it makes me want to cry.
\n" ); document.write( "Let the volume of water that must be added be $\"x\"$ .
\n" ); document.write( "The amount of alcohol in the solution is 40% of 12L, or
\n" ); document.write( " $\"0.40%2A12L=4.8L\"$
\n" ); document.write( "If that amount is to be 30% of the expected volume (in liters) of $\"12%2Bx\"$ ,
\n" ); document.write( "then $\"0.30%2A%2812%2Bx%29=4.8\"$
\n" ); document.write( " $\"3.6%2B0.30x=4.8\"$ --> $\"0.30x=1.2\"$ --> $\"x=1.2%2F0.30\"$ --> $\"x=4.0\"$
\n" ); document.write( "You need to add 4.0L water. \n" ); document.write( "

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