Set up this problem as a ratio:
(1/3) cup kernels: 2 quarts popcorn
4 cups kernels: ? quarts popcorn
= 4 / (1/3) = x / 2
= 12 = x / 2
x = 24
If a bucket holds 4 quarts, and there are 24 quarts of popcorn,
then 24 / 4 = 6 buckets are needed (C).