Alice made 1 1/2 pounds of trail mix. If she puts 1/2 of a pound into each bag, how many bags can Alice fill?

1 1/2 = 1 + 1 / 2 =1 .5

1 / 2 = 0.5

1 1/2 / 1/2 = 1.5 / 0.5 = 10 ∙ 1.5 / 10 ∙ 0.5 = 15 / 5 = 3

Alice can fill 3 bags.