Question 864916
<a href="http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev">Study this lesson for one material known and one material unknown. </a>


{{{highlight_green((6*9+4*y)/(y+6)=7)}}}
y is for how much pounds of the cheaper coffee to add.
Solve for y.