Question

畜牧场有绵羊,山羊共800只.山羊的五分之二比绵羊的二分之一多50只,山羊,绵羊各多少只?

Answer 1

解设山羊x只

2/5x-1/2（800-x）=50

2/5x-400+1/2x=50

9/10x=450

x=500

800-500=300只

答山羊500绵羊300只