3 boxes have some average weight. When one box which weighs 89 kg is replaced by another box, the average weight increases by 5 kg. What is the new box weight?

🧠 Explanation:

Three boxes’ average weight increases by 5 kg when a 89 kg box is replaced by a 104 kg box. Solve: new box = 89 + 3 × 5 = 104. This teaches students how to solve average problems in math or real-world scenarios.