document.write( "Question 324843: your radiator holds 5 gallons of fluid. if it is full with a 15% solution, how much fluid should be drained and replaced with a 65% antifreeze mixture to result in a 40% mixture of antifreeze? \n" ); document.write( "
Algebra.Com's Answer #232581 by stanbon(75887)\"\" \"About 
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your radiator holds 5 gallons of fluid. if it is full with a 15% solution, how much fluid should be drained and replaced with a 65% antifreeze mixture to result in a 40% mixture of antifreeze?
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\n" ); document.write( "active - active + active = active
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\n" ); document.write( "0.15*5 - 0.15x + 0.65x = 0.40*5
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\n" ); document.write( "Multiply thru by 100 to get:
\n" ); document.write( "15*5 - 15x + 65x = 40*5
\n" ); document.write( "50x = 25*5
\n" ); document.write( "x = (1/2)(5)
\n" ); document.write( "x = 2.5 gallons (amt. of 15% solution that
\n" ); document.write( "should be replaced with 65% solution.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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