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)\"\" \"About 
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How many ml of 20 percent acid should be added to pure acid
\n" ); document.write( " to make 40 ml of 35 percent acid?
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\n" ); document.write( "let x = amt of 20% mixture
\n" ); document.write( "then
\n" ); document.write( "(40-x) = amt of pure acid
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\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 = \"%28-26%29%2F%28-.8%29\"
\n" ); document.write( "x = +32.5 ml of 20% stuff
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