document.write( "Question 489801: How much water must be evaporated from 32oz of a 4% solution to make a 6% salt solution? \n" ); document.write( "

Algebra.Com's Answer #333778 by josmiceli(19441) $\"\"$ $\"About$

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The key is that you have as much salt after evaporation as before
\n" ); document.write( "In words:
\n" ); document.write( "(ounces of salt)/(total salt + water solution at end) = 6%
\n" ); document.write( "given:
\n" ); document.write( " $\"+.04%2A32+=+1.28+\"$ ounces of salt at start
\n" ); document.write( " $\"+32+-+1.28+=+30.72+\"$ ounces of water at start
\n" ); document.write( "-------------------
\n" ); document.write( "Let $\"+w+\"$ = ounces of water to be evaporated
\n" ); document.write( " $\"+1.28+%2F+%2832+-+w%29+=+.06+\"$
\n" ); document.write( " $\"+1.28+=+.06%2A%2832+-+w%29+\"$
\n" ); document.write( " $\"+1.28+=+1.92+-+.06w+\"$
\n" ); document.write( " $\"+.06w+=+1.92+-+1.28+\"$
\n" ); document.write( " $\"+.06w+=+.64+\"$
\n" ); document.write( " $\"+w+=+10.667+\"$
\n" ); document.write( "10.667 ounces of water must be evaporated
\n" ); document.write( "check:
\n" ); document.write( "That leaves $\"+30.72+-+10.667+=+20.053+\"$ ounces of water
\n" ); document.write( " $\"+1.28+%2F+%28+20.053+%2B+1.28+%29+=+1.28+%2F+21.333+\"$
\n" ); document.write( " $\"+1.28+%2F+21.333+=+.06000+\"$
\n" ); document.write( "OK \n" ); document.write( "

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