document.write( "Question 269204: A nurse wishes to add water to 45 ounces of a 17% solution of benzalkonium chloride to dilute it to an 10% solution. How much water must she add? \n" ); document.write( "

Algebra.Com's Answer #197300 by AnlytcPhil(1806) $\"\"$ $\"About$

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A nurse wishes to add water to 45 ounces of a 17% solution of benzalkonium chloride to dilute it to an 10% solution. How much water must she add?\r
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document.write( "The 45 oz of 17% solution contains (.17)(45) or 7.65 oz of benzalkonium\r\n" );
document.write( "chloride (ADBAC) and the rest water.  If he adds x oz of water then he'll\r\n" );
document.write( "have 45+x oz of liquid of which 7.65 oz is ADBAC.  \r\n" );
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document.write( "Then the 7.65 oz of ADBAC will be (equal) 10% of the 45 + x oz. of liquid.\r\n" );
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document.write( "Multiply both side by 100 moves the decimals right two places:\r\n" );
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document.write( "Solve that and get 31.5 oz of water to add\r\n" );
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document.write( "Edwin

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