I will. If there are x people in the gym, there will be (150-X) people in the recreation room, and 20%( 150-X) people will come to the gym because 10%X goes to the recreation room every time. So when it is stable, that is, 10%X=20%( 150-X), we can get X= 100. When x >: in 100, 10%X >; 20%( 150-X), as time goes by, more and more people go to the recreation room, and the number of people in the gym will be stable when it reaches 100. When x