Answer:
First, we need to find the total amount of trail mix that Sarah makes. The total amount of trail mix is the sum of the amount of almonds, dried cherries, walnuts, and raisins.
2 1/2 cups almonds + 3/4 cup dried cherries + 2 1/4 cups walnuts + 3/4 cup raisins = 5 3/4 cups
Next, we need to divide the total amount of trail mix by the amount of trail mix that each bag holds.
5 3/4 cups / 1 1/4 cups per bag = 4.6 bags (rounded down to 4 bags)
Therefore, Sarah fills 4 bags of trail mix.