Question 879721
{{{(250*80-v*80+v*40)/250=72}}}
{{{(250*80+(40-80)v)/250=72}}}
{{{(250*80-40v)/250=72}}}
{{{250*80-40v=250*72}}}
{{{250*80-250*72=40v}}}
{{{250*8=40v}}}
{{{v=25*2}}}
{{{highlight(v=50)}}}, volume spilled and replaced, mililiters.


This works just like other drain-and-replace problems:
<a href="http://www.algebra.com/tutors/drain-and-replace-antifreeze.lesson?content_action=show_dev">Drain and Replace: Radiator Antifreeze Mixture</a>