analyse

(1) Assume that 10 charters are all large ships, and the ships have to take 6× 10= 60 (people).

② Assume that the total number of people is 60-(41+1) =18 (people) more than the actual number. The reason for the increase is that it is assumed that all four people on board are six.

(3) When a ship is a big ship, there are two more people, and the extra 18 people is 18÷2=9 (a ship) as a big ship.

explain

[6× 10-(4 1+ 1)]÷(6-4)

= 18÷2

=9 (bar)

10-9= 1 (article)

Answer: 9 ships, 1 large ship.