Question 880733
The problem solution works as explained in the lesson:
<a href="http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev">Click this link to read and study the lesson.  Mixture: one material quantity unknown</a>


v is how many quarts of pure material to add.
{{{highlight((20*3+100v)/(v+3)=50)}}}