To determine how many invitations each person has to take to the post office, we first need to find out how many people are mailing the invitations. Susan, Benjamin, and the three members of the bridal party means there are a total of:
1 (Susan) + 1 (Benjamin) + 3 (bridal party members) = 5 people
Now, to find out how many invitations each person needs to mail, we divide the total number of invitations (225) by the number of people (5):
225 invitations รท 5 people = 45 invitations per person
So, each person has to take 45 invitations to the post office.
The correct response is 45.