Question 1084755
x, volume of 100% antifreeze to add


{{{amountAntifreeze*100/totalVolume=percentMixture}}}


{{{(100x+25*40)/(x+40)=60}}}

-

{{{(10x+100)/(x+40)=6}}}

{{{10x+100=6x+240}}}

{{{4x+100=240}}}

{{{x+25=60}}}

{{{highlight(x=35)}}}------{{{quarts}}}