document.write( "Question 831330: How many liters of pure alcohol must be added to 5 liters of a 15% alcohol solution to make a 25% solution? \n" ); document.write( "

Algebra.Com's Answer #501241 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = liters of pure alcohol needed
\n" ); document.write( " $\"+%28+x+%2B+.15%2A5+%29+%2F+%28+x+%2B+5+%29+=+.25+\"$
\n" ); document.write( " $\"+x+%2B+.75+=+.25%2A%28+x%2B5+%29+\"$
\n" ); document.write( " $\"+x+%2B+.75+=+.25x+%2B+1.25+\"$
\n" ); document.write( " $\"+.75x+=+.5+\"$
\n" ); document.write( " $\"+x+=+.667+\"$ liters
\n" ); document.write( "2/3 of a liter of pure alcohol must be added
\n" ); document.write( "-----------------
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+x+%2B+.15%2A5+%29+%2F+%28+x+%2B+5+%29+=+.25+\"$
\n" ); document.write( " $\"+%28+.667+%2B+.15%2A5+%29+%2F+%28+.667+%2B+5+%29+=+.25+\"$
\n" ); document.write( " $\"+.667+%2B+.75+=+.25%2A5.667+\"$
\n" ); document.write( " $\"+1.417+=+1.4168+\"$
\n" ); document.write( "close enough
\n" ); document.write( " \n" ); document.write( "

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