document.write( "Question 213620: How many gallons of pure alcohol should be mixed with 20 gallons of 15% alcohol solution to obtain a mixture that is 25% alcohol? \n" ); document.write( "

Algebra.Com's Answer #161415 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"x\"$ = gallons of alcohol to be added
\n" ); document.write( "In words:
\n" ); document.write( "(original alcohol + added alcohol)/(total mixture) = 25%
\n" ); document.write( " $\"%28.15%2A20+%2B+x%29%2F%2820+%2B+x%29+=+.25\"$
\n" ); document.write( " $\"3+%2B+x+=+.25%2A%2820+%2B+x%29\"$
\n" ); document.write( " $\"3+%2B+x+=+5+%2B+.25x\"$
\n" ); document.write( " $\".75x+=+5+-+3\"$
\n" ); document.write( " $\".75x+=+2\"$
\n" ); document.write( " $\"x+=+2.67\"$
\n" ); document.write( "2.67 gallons of alocohol must be added \n" ); document.write( "

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