document.write( "Question 764847: How many ml of 20 percent acid should be added to pure acid to make 40 ml of 35 percent acid?
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Algebra.Com's Answer #465766 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! How many ml of 20 percent acid should be added to pure acid \n" ); document.write( " to make 40 ml of 35 percent acid? \n" ); document.write( ": \n" ); document.write( "let x = amt of 20% mixture \n" ); document.write( "then \n" ); document.write( "(40-x) = amt of pure acid \n" ); document.write( ": \n" ); document.write( ".20x + (40-x) = .35(40) \n" ); document.write( ".20x + 40 - x = 14 \n" ); document.write( "-.8x = 14 - 40 \n" ); document.write( "-.8x = -26 \n" ); document.write( "x = \n" ); document.write( "x = +32.5 ml of 20% stuff \n" ); document.write( " |