document.write( "Question 366383: A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are grown. The sterilization tank contains 120 gal of a solution of 4% ordinary household bleach mixed with pure distilled water. New research indicates that the concentration of bleach should be 6% for complete sterilization. How much of the solution should be drained and replaced with bleach to increase the bleach content to the recommended level? \n" ); document.write( "
Algebra.Com's Answer #261079 by josmiceli(19441)![]() ![]() You can put this solution on YOUR website! Let \n" ); document.write( "given: \n" ); document.write( "Bleach in 4% solution: \n" ); document.write( " \n" ); document.write( "Bleach in removed portion: \n" ); document.write( " \n" ); document.write( "Gallons of bleach added: \n" ); document.write( " \n" ); document.write( "---------- \n" ); document.write( "In words: \n" ); document.write( "(initial gallons of bleach - bleach removed + bleach added)/(total gallons) = 6% \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "2.5 gallons of 4% solution must be drained \n" ); document.write( "and replaced with pure bleach \n" ); document.write( " |