Question 976378
This could be done using just ONE variable, but here is a lesson using two unknown variables.


<a href="http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev">Lesson:  Two Part Mixture, both quantities unknown</a>
http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev