document.write( "Question 753146: how much pure alcohol should be added to 600ml,15% alcohol solution to make it contain 25% alcohol? \n" ); document.write( "

Algebra.Com's Answer #458276 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = ml of pure alcohol to be added
\n" ); document.write( " $\"+.15%2A600+=+90+\"$ ml of alcohol in 15% solution
\n" ); document.write( "-------------
\n" ); document.write( " $\"+%28+x+%2B+90+%29+%2F+%28+x+%2B+600+%29+=+.25+\"$
\n" ); document.write( " $\"+x+%2B+90+=+.25%2A%28+x+%2B+600+%29+\"$
\n" ); document.write( " $\"+x+%2B+90+=+.25x+%2B+150+\"$
\n" ); document.write( " $\"+.75x+=+60+\"$
\n" ); document.write( " $\"+x+=+80+\"$
\n" ); document.write( "80 ml of pure alcohol should be be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+x+%2B+90+%29+%2F+%28+x+%2B+600+%29+=+.25+\"$
\n" ); document.write( " $\"+%28+80+%2B+90+%29+%2F+%28+80+%2B+600+%29+=+.25+\"$
\n" ); document.write( " $\"+170+%2F+680+=+.25+\"$
\n" ); document.write( " $\"+170+=+.25%2A680+\"$
\n" ); document.write( " $\"+170+=+170+\"$
\n" ); document.write( "OK \n" ); document.write( "

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