2. At the first stop, 18 passengers entered an empty bus. Then at each stop, 4 people got off and 6 people got on. How many passengers were in the bus between the fourth and fifth stops?
Answer: 24 people.

## Solution.

## Method 1.

After each stop, except the first one, the number of passengers in the bus increases by 2 people. Therefore, from the second to the fourth stop, the number of people increased by 6 people. That is, it became $18+6=24$ people.

Method 2.

From the second to the fourth stop, $3 \cdot 4=12$ people got off, and $3 \cdot 6=18$ people got on. That is, the number of people in the bus became $18-12+18=24$ people.

## Grading Criteria.

- Correct solution - 7 points.
- Incorrect answer, but a correct part of the solution. For example, it is found that the number of passengers increases by 2 after each stop - 2-3 points.
- Only the correct answer - $\mathbf{1}$ point.