document.write( "Question 694318: how many grams of water must be evaporated from 10 grams of 40 % saline to produce a 50 % solution
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Algebra.Com's Answer #427828 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
there is $\"+.4%2A10+=+4+\"$ grams of salt in the 40% solution
\n" ); document.write( "Let $\"+w+\"$ = grams of water to be evaporated
\n" ); document.write( "When the water is all evaporated, you still have $\"+4+\"$ grams of
\n" ); document.write( "salt in the solution
\n" ); document.write( "-----------------
\n" ); document.write( " $\"+4+%2F+%28+10+-+w+%29+=+.5+\"$
\n" ); document.write( " $\"+4+=+.5%2A%28+10+-+w+%29+\"$
\n" ); document.write( " $\"+4+=+5+-+.5w+\"$
\n" ); document.write( " $\"+.5w+=+5+-+4+\"$
\n" ); document.write( " $\"+.5w+=+1+\"$
\n" ); document.write( " $\"+w+=+2+\"$
\n" ); document.write( "2 grams of water must be evaporated to
\n" ); document.write( "produce a 50% solution
\n" ); document.write( "--------------------
\n" ); document.write( "check:
\n" ); document.write( "There is $\"+10+-+4+=+6+\"$ grams of water to start with
\n" ); document.write( "There is $\"+6+-+2+=+4+\"$ grams of water left
\n" ); document.write( "The solution is $\"+4+%2B+4+=+8+\"$ grams total
\n" ); document.write( " $\"++4+%2F+8+=+.5+\"$
\n" ); document.write( "OK\r
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