To determine how many invitations each person has to take to the post office, first, we need to know the total number of people mailing the invitations.
There are:
- Susan
- Benjamin
- 3 members of the bridal party
This gives us a total of: 1 (Susan) + 1 (Benjamin) + 3 (members) = 5 people
Next, we divide the total number of invitations (225) by the number of people (5) to see how many invitations each person needs to take:
225 invitations รท 5 people = 45 invitations per person.
So, each person has to take 45 invitations to the post office.
The correct answer is 45.