They are all couples
Three possibilities: 1. You are not looking at the ship. 2. You are blind. 3. The people are all INSIDE the ship.
Its a differnet boat with no people!
they were couples
They are all married
They were all married.
If you are asking: I walk across a bridge and see a boat full of people yet there isn't a single person on the boat. How is this? The answer is, "All the people on the boat are married."
Everyone on the boat was married
There are no number restrictions.
Person.
0.4Assuming we are talking about people standing up ...In a recent article about counting crowds, it was stated that when people standing are very close together, each person will occupy about 2.5 square feet. People in a real crowd won't feel comfortable standing so close together, and will each take about 5 ft2.1 ft2 is about 0.092903m2, so these values translate to about 0.23 and 0.46 respectively. A good straightforward answer would be about 0.4 m2.
A single person.
As a group, it is a population; a single person is a citizen. The people of a place are also called inhabitants; or a single person is an inhabitant.