document.write( "Question 833368: How much water must be evaporated from 7 qt of a 50% antifreeze solution to produce a 70% solution? \n" ); document.write( "
Algebra.Com's Answer #502515 by ankor@dixie-net.com(22740)\"\" \"About 
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How much water must be evaporated from 7 qt of a 50% antifreeze solution to produce a 70% solution?
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\n" ); document.write( "Let w = amt of water to be evaporated
\n" ); document.write( ".50(7) = .7(7-w)
\n" ); document.write( "3.5 = 4.9 - .7w
\n" ); document.write( ".7w = 4.9 - 3.5
\n" ); document.write( ".7w = 1.4
\n" ); document.write( "w = 1.4/.7
\n" ); document.write( "w = 2 qt evaporated
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\n" ); document.write( "Check
\n" ); document.write( ".50(7) = .7(5) \n" ); document.write( "
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