244. Annoying Breakdowns. On the occasion of the holiday, many residents of the town gathered to spend the day in the great outdoors. For this purpose, they hired all the available vans, with the same number of people in each van. Halfway through, 10 vans broke down, so each remaining van had to take one extra person. When everyone decided to head home, unfortunately, it turned out that another 15 vans had broken down. Therefore, each van had to take three more people than it had in the morning.

How many people participated in this mass outing?
244. There were 900 people in total. Initially, 100 vans, each carrying 9 people, set off. After 10 vans broke down, the remaining vans had 10 people each (one extra person). When 15 more vans broke down during the return trip, each of the 75 remaining vans had 12 people (three more people than in the morning when they set off).