Question 662267
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Hi,
A radiator contains 15 quarts of fluid, 30% of which is antifreeze. 
<u>How much</u> fluid{{{highlight(x)}}} should be drained and 
replaced with pure antifreeze so that the new mixture is 55% antifreeze?
 x + .30(15-x) = .55*15
     .70x = .25*15
        x = .25*15/.70