8.1. The students of a school went on a trip in six buses. The number of students in the buses was not necessarily equal, but on average, there were 28 students per bus. When the first bus arrived at the destination, the average number of students in the buses that continued moving became 26. How many students were in the first bus
Answer: 38.

Solution: The initial total number of schoolchildren was $28 \cdot 6=168$. After the first bus finished its trip, there were $26 \cdot 5=130$ schoolchildren left. Therefore, there were $168-130=38$ schoolchildren in the first bus.

Comment: A correct answer without justification - 0 points.