Question 781560
Have 30% concentration; want 50% concentration, no change in volume.

v = volume gallons of the 30% to remove and replace with pure.


{{{(2.5*30-v*30+v*100)/2.5=50}}}------You need to understand this equation.
{{{(2.5*30+(100-30)v)/2.5=50}}}
{{{75+70v=125}}}
{{{70v=125-75}}}
{{{v=50/70=highlight(5/7)}}}


Remove {{{5/7}}} of a gallon and replace with pure 100% antifreeze.