There are three rooms and double rooms in the room department of the hotel. The charge data is shown in the table below. In order to attract tourists, 50% discount for group stay is implemented. A 50 person hotel is available During the discount period, the tour group stayed in the hotel and stayed in some three person ordinary rooms and two person ordinary rooms. If each room is just full and the total cost of accommodation is 1510 yuan per day, how many three person ordinary rooms and two person ordinary rooms did the tour group stay in? The first is the ordinary version, and the second is the luxury version

There are three rooms and double rooms in the room department of the hotel. The charge data is shown in the table below. In order to attract tourists, 50% discount for group stay is implemented. A 50 person hotel is available During the discount period, the tour group stayed in the hotel and stayed in some three person ordinary rooms and two person ordinary rooms. If each room is just full and the total cost of accommodation is 1510 yuan per day, how many three person ordinary rooms and two person ordinary rooms did the tour group stay in? The first is the ordinary version, and the second is the luxury version

There are x rooms for three and Y rooms for two;
Formula 1 (150x + 140y) * 50% = 1510
Formula 2 3x + 2Y = 50
The solution is x = 8, y = 13
The answer: among 50 people, 24 people used 8 three person rooms, 26 people used 13 double rooms

There are three double rooms in the room department of a hotel. The charging standard of each room is as follows:
Three people: 150 yuan
Double room: 140 yuan
A group of 20 people stayed in the hotel and stayed in some three room and double room rooms, and each room was just full. It cost 1280 yuan to stay one day. How many three room and double room did the group stay in
Solve the equation of first degree with two variables

Three rooms are set as X and double rooms as y
3x+2y=20
150x+140y=1280
The solution is x = 2, y = 7