Final answer:
For a student weighing 70 pounds, the maximum backpack weight recommended by health experts is between 7 to 10.5 pounds, which is 10-15% of their body weight, to prevent back strain and posture issues.
Step-by-step explanation:
The question relates to the health and well-being of students concerning the weight they carry in their backpacks or bags. Health experts often recommend that a student should not carry a backpack that weighs more than 10-15% of their body weight. Therefore, for a student who weighs 70 pounds, the maximum weight they should carry is between 7 to 10.5 pounds. Carrying more than this recommended weight could lead to back strain or other issues. Regularly carrying a heavy backpack can cause pain and posture problems, so it's crucial to keep the weight within safe limits.