Question 947166
Form an expression for {{{dollars/pounds}}}.


p, how many pounds of the candy, $2.50 per pound to add.


{{{((2.5)p+(10.5)(20))/(p+20)=7.5}}}



Also you could study this:
<a href="http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev">http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev</a>