Question

草地上有牛羊各诺干.牵一头牛去喝水,草地上牛羊一样多；诺赶一只羊去吃草,草地上牛的数是羊的2倍求牛羊各几只?

Answer 1

羊x只,牛（x+1)只

x+1=2(x-1)

x=3

x+1=4

羊3只,牛4只