document.write( "Question 181824: how many quarts of 20% saline solution must be mixed with some 50% saline solution to obtain a mixture of 30 quarts of mixture that is 40%? \n" ); document.write( "
Algebra.Com's Answer #136428 by nerdybill(7384)\"\" \"About 
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Let x = quarts of 20% saline
\n" ); document.write( "then
\n" ); document.write( "30-x = quarts of 50% saline
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\n" ); document.write( "Our equation:
\n" ); document.write( ".20x + .50(30-x) = .40(30)
\n" ); document.write( ".20x + 15 - .50x = 12
\n" ); document.write( "15 - .30x = 12
\n" ); document.write( "15 = .30x + 12
\n" ); document.write( "3 = .30x
\n" ); document.write( "10 quarts = x (amount of 20% saline solution)
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\n" ); document.write( "50% saline solution:
\n" ); document.write( "30-x = 30-10 = 20 quarts (amount of 50% saline solution)\r
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