document.write( "Question 892601: How many liters of pure alcohol must be added to 15 Liters of a 40% solution to obtain a 70% solution? \n" ); document.write( "

Algebra.Com's Answer #540623 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+x+\"$ = liters of pure alcohol to be added
\n" ); document.write( " $\"+.4%2A15+=+6+\"$ liters of alcohol in 40% solution
\n" ); document.write( "------------------
\n" ); document.write( " $\"+%28+x+%2B+6+%29+%2F+%28+x+%2B+15+%29+=+.7+\"$
\n" ); document.write( " $\"+x+%2B+6+=+.7%2A%28+x+%2B+15+%29+\"$
\n" ); document.write( " $\"+x+%2B+6+=+.7x+%2B+10.5+\"$
\n" ); document.write( " $\"+.3x+=+4.5+\"$
\n" ); document.write( " $\"+x+=+15+\"$
\n" ); document.write( "15 liters of pure alcohol must be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+x+%2B+6+%29+%2F+%28+x+%2B+15+%29+=+.7+\"$
\n" ); document.write( " $\"+%28+15+%2B+6+%29+%2F+%28+15+%2B+15+%29+=+.7+\"$
\n" ); document.write( " $\"+21%2F30+=+.7+\"$
\n" ); document.write( " $\"+21+=+.7%2A30+\"$
\n" ); document.write( " $\"+21+=+21+\"$
\n" ); document.write( "OK \n" ); document.write( "

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