数学题：儿童的负重最好不要超过体重的20分之3。如果长期背负过重的物体，会导致腰痛及背痛，严重的甚至会妨碍骨骼生长。小乐的书包超重吗？为什么?(书包重5kg，体重30kg)

数学题解答：超了，5/30大于3/20。

推荐阅读：
Creating a Website for Your Brand: 4 Best Practices You Must Con　 What Is Content and Why Does It Matter?　 5 Things to Know When Starting a Financial Blog　 How to Improve the Marketing for Your Online Business　 Building an Online Store – What You Need to Do　 Independent Digital Media Is Being Shut Down Around the World, a　 Using the Windows Hardware Tool to Error Checking and Optimize Y　 The Union Find (Disjoint Set) Implementation in Java/C++　 How to use the Leetcode’s Mock Interview Overview to Nail 　 Replace Harddrives when CrystalDiskInfo Shows Caution Health Sta