document.write( "Question 815190: How many gallons of distilled water must be added with 50 gallons of 30% alcohol solution to obtain a 25% solution ? \n" ); document.write( "

Algebra.Com's Answer #490772 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = gallons of distilled water needed
\n" ); document.write( " $\"+.3%2A50+=+15+\"$ gallons of alcohol in 30% solution
\n" ); document.write( "--------------
\n" ); document.write( " $\"+15+%2F+%28+w+%2B+50%29+=+.25+\"$
\n" ); document.write( " $\"+15+=+.25%2A%28+w+%2B+50+%29+\"$
\n" ); document.write( " $\"+15+=+.25w+%2B+12.5+\"$
\n" ); document.write( " $\"+.25w+=+2.5+\"$
\n" ); document.write( " $\"+w+=+2.5%2F.25+\"$
\n" ); document.write( " $\"+w+=+10+\"$
\n" ); document.write( "10 gallons of water must be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+15+%2F+%28+w+%2B+50%29+=+.25+\"$
\n" ); document.write( " $\"+15+%2F+%28+10+%2B+50%29+=+.25+\"$
\n" ); document.write( " $\"+15+=+.25%2A60+\"$
\n" ); document.write( " $\"+15+=+15+\"$
\n" ); document.write( "OK \n" ); document.write( "

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