This is the problem of solving a system of linear equations with three variables. Let male X and female Y be small zx+y+z =1003x+2y+0.5z =100. Because there is no horse, X >: =0, y & gt=0, z & gt=0, and it must be an integer. In the process of solving the equation, you will find that y must be a multiple of 5, and x+(3y/5)=20. According to the relationship between them, (x, y, z) is (20,0,40) (17,5,38) (14,68).