Answer :
Multiply the number of bags by the ounces in each bag:
8 x 3 1/2 = 28 total ounces.
Divide total ounces by the number of hikers:
28 / 12 = 2.33 ounces per hiker.
1 cup = 8 ounces.
Divide the number of ounces per hiker by the number of ounces in 1 cup:
2.33 / 8 = 0.29 cups per hiker.