You have an apple you give it to me, what % of the apple do you have left?
eta is it the apple question?
Well, let's take a look at that . You buy an apple that weighs 80 grams. You eat as much of the apple as you can. The apple has seeds, a core and a stem. So, you eat 100% of what you're able to eat. But the core, the stem, the seeds are still there. You ate the whole apple, so does that mean there was no waste? Absolutely nothing remained? Or, somehow, less than nothing remained?
In your home, do you leave apple cores lying around the living room because they mathematically don't count as garbage?