document.write( "Question 12470: how much water must be evaporated from 32 ounces of a 4% salt solution to produce a 6% salt solution? \n" ); document.write( "
Algebra.Com's Answer #6343 by Earlsdon(6294)\"\" \"About 
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Let's see, 32 oz of 4% salt solution is 96% water and 6% salt solution is 94% water. Since we are not removing any salt, the question can be rephrased: How much water must be evaporated from 32 oz of 96% water solution to produce a 94% water solution? Change the percentages to decimals. 94% = 0.94, 96% = 0.96, 100% = 1\r
\n" ); document.write( "\n" ); document.write( "The equation is now in terms of water rather than salt:\r
\n" ); document.write( "\n" ); document.write( "\"32%280.96%29+-+x%281%29+=+%2832-x%29%280.94%29\"\r
\n" ); document.write( "\n" ); document.write( "\"30.72+-+x+=+30.08+-+0.94x\" Subtract 30.08 from both sides.\r
\n" ); document.write( "\n" ); document.write( "\"0.64+-+x+=+-0.94x\" Add x to both sides.\r
\n" ); document.write( "\n" ); document.write( "\"0.64+=+0.06x\" Divide both sides by 0.06\r
\n" ); document.write( "\n" ); document.write( "\"x+=+0.64%2F0.06\"\r
\n" ); document.write( "\n" ); document.write( "\"x+=+10.67\"\r
\n" ); document.write( "\n" ); document.write( "So, 10.67 oz of water must be evaporated. This is one third of the original 32 oz. of solution.\r
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