document.write( "Question 486402: The radiator in a car is filled with a solution of 75% antifreeze and 25% water. The manufacturer of the antifreeze suggests that for summer driving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is 3.6 L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?
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Algebra.Com's Answer #332551 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The radiator in a car is filled with a solution of 75% antifreeze and 25% water.
\n" ); document.write( " The manufacturer of the antifreeze suggests that for summer driving, optimal cooling of the engine is obtained with only 50% antifreeze.
\n" ); document.write( " If the capacity of the radiator is 3.6 L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?
\n" ); document.write( ":
\n" ); document.write( "Let x = amt to be drained and amt of water to be added to accomplish this
\n" ); document.write( ":
\n" ); document.write( ".75(3.6-x) = .50(3.6)
\n" ); document.write( "2.7 - .75x = 1.8
\n" ); document.write( "-.75x = 1.8-2.7
\n" ); document.write( "-.75x = -.9
\n" ); document.write( "x = $\"%28-.9%29%2F%28-.75%29\"$
\n" ); document.write( "x = + 1.2 liters to be drained and replaced with 1.2 liters of water \n" ); document.write( "

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