Question 906507
This is what you must understand:
<a href="http://www.algebra.com/my/mixture-price-two-part-both-parts-unknown.lesson?content_action=show_dev">http://www.algebra.com/my/mixture-price-two-part-both-parts-unknown.lesson?content_action=show_dev</a>



The reason for the lesson is so you can solve more than just one specific exercise item ; and be able to solve EVERY problem that fits the same form.