Question 936563
<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>


That is the answer.
STUDY THE LESSON.


You asked for help on one example.  The knowledge in the lesson will solve all such examples which are of the same form.