## Precalculus (6th Edition) Blitzer

$6$ pound of raisins and $4$ pound of granola
Step 1. Assume we need $x$ pounds of raisins and $y$ pounds of granola; the total weight is $x+y=10$, or $y=10-x$ Step 2. The total cost is $2x+3.25y=2.5(10)$ Step 3. Using substitution, we have $2x+3.25(10-x)=25$ or $2x+32.5-3.25x=25$ and $1.25x=7.5$, thus $x=6$ and $y=4$ pounds.