A box has 900 balls. 90% are red.

every ball is actually red.

Then 100% are red.

Not red = 0

Fun alternative: 0

The important difference is this:

The first answer follows the given information.

The second answer changes the situation and becomes a creative “what if” idea, not the correct mathematical solution.

So if your teacher asks this question, choose 90.

If your friend sends it as a brain continue reading …