If each boat takes 10 people, there will be 2 more seats; if each boat takes two more people, there will be one less boat

If each boat takes 10 people, there will be 2 more seats; if each boat takes two more people, there will be one less boat

If there are X students in grade four, the number of boats will remain the same
So (x + 2) △ 10 = x △ 12 + 1
The solution is x = 48
There are 48 fourth grade students