❤️MathFollowMeandPracticeeveryday💯🤔️Topictoday：Pan-balancePr

❤️Math Follow Me and Practice everyday 💯

🤔️Topic today：Pan-balance Problems天平⚖️问题

🔑Key words

▶️perfect balance完全平衡

▶️One block weighs as much as 2 balls.1个木块和2个球一样重

▶️consistent with一致

▶️compass圆规，marble弹珠，coin硬币，cube小方块