document.write( "Question 706361: How much water should be added to 20mL of 12% alcohol solution to reduce the concentration to 10%?
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Algebra.Com's Answer #435108 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = mL of water to be added
\n" ); document.write( " $\"+.12%2A20+=+2.4+\"$ mL of alcohol in 12% solution
\n" ); document.write( "---------------
\n" ); document.write( " $\"+2.4+%2F+%28+20+%2B+w+%29+=+.1+\"$
\n" ); document.write( " $\"+2.4+=+.1%2A%28+20+%2B+w+%29+\"$
\n" ); document.write( " $\"+2.4+=+2+%2B+.1w+\"$
\n" ); document.write( " $\"+.1w+=+.4+\"$
\n" ); document.write( " $\"+w+=+4+\"$
\n" ); document.write( "4 mL of water must be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+2.4+%2F+%28+20+%2B+4+%29+=+.1+\"$
\n" ); document.write( " $\"+2.4+%2F+24+=+.1+\"$
\n" ); document.write( " $\"+2.4+=+.1%2A24+\"$
\n" ); document.write( " $\"+2.4+=+2.4+\"$
\n" ); document.write( "OK \n" ); document.write( "

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