In order to attract tourists, a 50% discount is offered for group accommodation. A 50-member tour group will stay in this hotel during the discount period.

Solution: After 50% discount for each triple room, it will be 75 yuan, and after 50% discount for each double room, it will be 70 yuan.

Let the common room for three people be X and the common room for two people be Y.

The equation set 3 x+2y=50 is obtained.

75x+70y= 15 10

Available x=8

y= 13

Three people, 8 ordinary rooms, double 13 rooms.