document.write( "Question 1041329: How much pure water must be mixed with 15 ounce of a 30% alcohol solution to obtain a 25% alcohol solution hint pure water is 0% alcohol \n" ); document.write( "

Algebra.Com's Answer #656286 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = ounces of water needed
\n" ); document.write( " $\"+.3%2A15+=+4.5+\"$ ounces of alcohol is 30% solution
\n" ); document.write( "-----------------------
\n" ); document.write( " $\"+4.5+%2F+%28+w+%2B+15+%29+=+.25+\"$
\n" ); document.write( " $\"+4.5+=+.25%2A%28+w+%2B+15+%29+\"$
\n" ); document.write( " $\"+4.5+=+.25w+%2B+3.75+\"$
\n" ); document.write( " $\"+.25w+=+.75+\"$
\n" ); document.write( " $\"+w+=+3+\"$
\n" ); document.write( "3 ounces of water is needed
\n" ); document.write( "-------------------------
\n" ); document.write( "check:
\n" ); document.write( " $\"+4.5+%2F+%28+w+%2B+15+%29+=+.25+\"$
\n" ); document.write( " $\"+4.5+%2F+%28+3+%2B+15+%29+=+.25+\"$
\n" ); document.write( " $\"+4.5+=+.25%2A18+\"$
\n" ); document.write( " $\"+4.5+=+4.5+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );