Question 897452
<a href="http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev">http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev</a>


Think of price as a form of concentration in unit of DOLLARS per POUND.  Your example is a two-part mixture problem.  One material quantity is unknown.