Question 903657
Same idea as the typical radiator antifreeze problem, but just using a "tank" instead of a radiator, and alcohol instead of antifreeze:


<a href="http://www.algebra.com/my/drain-and-replace-antifreeze.lesson?content_action=show_dev">http://www.algebra.com/my/drain-and-replace-antifreeze.lesson?content_action=show_dev</a>