document.write( "Question 449124: The radiator in Natalie’s car contains 6.3 L of antifreeze and water. This mixture is 30% antifreeze. How much of this mixture should she drain and replace with pure antifreeze so that there will be a mixture of 50% antifreeze? \n" ); document.write( "
Algebra.Com's Answer #308989 by mananth(16946)\"\" \"About 
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------ percent ---------------- quantity
\n" ); document.write( "Antifreez1 I 80 ---------------- 40 gallons
\n" ); document.write( "Antifreeze II 10 ---------------- x gallons
\n" ); document.write( "Total 30 ---------------- 40 + x gallons
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\n" ); document.write( "30*6.3+100*x=50(6.3+x)
\n" ); document.write( "189+100x =315+50x
\n" ); document.write( "100x-50x =315-189
\n" ); document.write( "50x=126
\n" ); document.write( "/50
\n" ); document.write( "x=2.52 liters 100% Antifreeze
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