Answer:
The minimum package Stan need to buy so that all his guests get a party favor is 4 packages.
Explanation:
Given;
total number of guest in the party = 20
number of party favor needed = 20 party favors
1 package = 6 party favor
then, 2 package = 12 party favor
3 package = 18 party favor
4 package = 24 party favor
24 party favor will serve all the guest.
Therefore, the minimum package Stan need to buy so that all his guests get a party favor is 4 packages.