document.write( "Question 166784: How much water should be added to 30 gallon of a solution that is 70% antifreeze to bring the antifreeze percentage down to 60%. \n" ); document.write( "

Algebra.Com's Answer #122892 by josmiceli(19441) $\"\"$ $\"About$

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In words:
\n" ); document.write( "(gallons of antifreeze in final solution)/(gallons of solution) = % antifreeze
\n" ); document.write( "Let $\"w\"$ = the gallons of water to be added
\n" ); document.write( "The gallons of final solution will be
\n" ); document.write( " $\"30+%2B+w\"$
\n" ); document.write( "Initially there is 70% antifreeze
\n" ); document.write( " $\".7%2A30+=+21\"$ gallons
\n" ); document.write( " $\"21+%2F+%2830+%2B+w%29+=+.6\"$
\n" ); document.write( " $\"21+=+18+%2B+.6w\"$
\n" ); document.write( " $\".6w+=+3\"$
\n" ); document.write( " $\"w+=+5\"$
\n" ); document.write( "5 gallons of water must be added to get a 60% solution
\n" ); document.write( "check:
\n" ); document.write( " $\"21+%2F+%2830+%2B+w%29+=+.6\"$
\n" ); document.write( " $\"21+%2F+%2830+%2B+5%29+=+.6\"$
\n" ); document.write( " $\"21%2F35+=+.6\"$
\n" ); document.write( " $\".6+=+.6\"$
\n" ); document.write( "OK \n" ); document.write( "

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