Question 852157
This discussion should make things clear for you:
<a href="http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev">Mixture for cost, one quantity known, one quantity unknown</a>
http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev


You do not need to rely on making a chart, but if a chart would help you, and you still need to do this, just say.