Solurtion
Given
1 pound of granola = $6.50
1 pound of Assorted nuts = $9.00
Total quantity to make = 9 pounds of trail mix
Total cost to be incurred = $8 X 9 = $72
Let the 9 pounds of trail mix to contain x pounds of granola and nuts ( 9 - x) pounds of Assorted nuts.
Total cost of each components ;
Total cost of granola = $6.50x
Total cost of Assorted nuts = $9(9-x)
In trial mix ;
Total cost = Total cost of granola + Total cost of Assorted nuts
Now there are x pounds of granola = 3.6 pounds of granola
And there are ( 9- x ) pounds of Assorted nuts = 9 - 3.6 = 5.4 pounds of Assorted nuts