document.write( "Question 981634: A beaker contains 30 kilograms of salt water that is 99% water and 1% salt by weight. The water is evaporated until the beaker is 98% water and 2% salt. How many kilograms of salt water are in the beaker at this time? PLEASE show your work. \n" ); document.write( "
Algebra.Com's Answer #602613 by josmiceli(19441)\"\" \"About 
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\"+.01%2A30+=+.3+\" kg of salt in 1% salt solution
\n" ); document.write( "Let \"+x+\" = the kg of water that is evaporated
\n" ); document.write( "away to give a 2% solution
\n" ); document.write( "\"+29.7+-+x+\" = kg of water in the final solution
\n" ); document.write( "\"+.02%2A%28+30+-+x+%29+\" = kg of salt in the final solution
\n" ); document.write( "----------------------------------------------
\n" ); document.write( "There is no salt removed, so the amount you start
\n" ); document.write( "with is the amount you end up with
\n" ); document.write( "\"+%28+.3+%2F+%28+30+-+x+%29%29+=+.02+\"
\n" ); document.write( "\"+.3+=+.02%2A%28+30-x+%29+\"
\n" ); document.write( "\"+.3+=+.6+-+.02x+\"
\n" ); document.write( "\"+.02x+=+.3+\"
\n" ); document.write( "\"+x+=+15+\"
\n" ); document.write( "15 kg of water is evaporated
\n" ); document.write( "\"+30+-+15+=+15+\"
\n" ); document.write( "15 kg of salt water is the final solution
\n" ); document.write( "------------------------
\n" ); document.write( "check answer:
\n" ); document.write( "\"+.02%2A15+=+.3+\" kg of salt in final solution
\n" ); document.write( "\"+.3+%2F+15+=+.02+\"
\n" ); document.write( "There is 2% salt in final solution
\n" ); document.write( "----------------------------
\n" ); document.write( "Another check is:
\n" ); document.write( "\"+.99%2A30+=+29.7+\" kg of water to start with
\n" ); document.write( "\"+29.7+-+15+=+14.7+\" kg of water in final solution
\n" ); document.write( "Now add the kg of salt in final solution
\n" ); document.write( "\"+14.7+%2B+.3+=+15+\" kg of final solution
\n" ); document.write( "OK\r
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