What One Throws Away As Waste May Be Valuable To Others. Do You Find This Sentence Meaningful In The Context Of This  Story? How? Explain With The Help Of An Example?

I found this sentence meaningful in context of the story. Sometimes what we throw is useful to others, like food. Instead of wasting it we should give it to some poor person. From the story I will take the example when the girl took that boy to the restaurant backyard and gave him vada to eat and other food items of the customers.