document.write( "Question 408285: How much water must be evaporated from 28 ounces of a 5% salt solution to make a 7% salt solution \n" ); document.write( "

Algebra.Com's Answer #287682 by josmiceli(19441) $\"\"$ $\"About$

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(final ounces of salt)/(final ounces of solution) = 7%
\n" ); document.write( "salt in 5% solution= $\".05%2A28+=+1.4\"$ ounces
\n" ); document.write( "Let $\"x\"$ = ounces of water evaporated from solution
\n" ); document.write( " $\"1.4%2F%2828+-+x%29+=+.07\"$
\n" ); document.write( " $\"1.4+=+.07%2A%2828+-+x%29\"$
\n" ); document.write( " $\"1.4+=+1.96+-+.07x\"$
\n" ); document.write( " $\".07x+=+.56\"$
\n" ); document.write( " $\"x+=+8\"$
\n" ); document.write( "8 ounces of water must be evaporated
\n" ); document.write( "check:
\n" ); document.write( " $\"1.4%2F%2828+-+8%29+=+.07\"$
\n" ); document.write( " $\"1.4%2F20+=+.07\"$
\n" ); document.write( " $\"1.4+=+1.4\"$
\n" ); document.write( "OK \n" ); document.write( "

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