document.write( "Question 844801: How much water must be evaporated from a 200 gallon solution that is 30% acid to obtain a solution that is 40% acid?
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Algebra.Com's Answer #508930 by ankor@dixie-net.com(22740)\"\" \"About 
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How much water must be evaporated from a 200 gallon solution that is 30% acid to obtain a solution that is 40% acid?
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\n" ); document.write( "Let w = amt of water to evaporated
\n" ); document.write( ".30(200) = .40(200-w)
\n" ); document.write( "60 = 80 - .4w
\n" ); document.write( ".4w = 80 - 60
\n" ); document.write( "w = 20/.4
\n" ); document.write( "w = 50 gal of water required to be evaporated
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