设x公马,y母马,和z小马 x>=0,y>=0,z>=0,z为偶数
x+y+z=100 (1)
3x+2y+z/2=100 (2)
(2)*2-(1) => 5x+3y=100 (3)
(3)=>y是5的倍数.(4)
(1)*4-(2)*2 =>3z-2x=200 (5)
=>z>=68 (6)
(1)*6-(2)*2=>
2y+5z=400 (7)
=>z 68