In that case, the number of balls that are not red would be:
0.
So why bring up this second answer?
Because many brain teasers encourage us to test our assumptions.
The puzzle invites us to think about percentages.
A playful thinker may ask:
“What if the information is misleading, incomplete, or intentionally tricky?”
In a real mathematical problem, we should trust the statement exactly as written.
And if we do that, 0 cannot be correct.
So we end up with two interesting viewpoints.
Viewpoint 1: Standard logic
Total balls: 900
Red balls: 90%
Not red: 10%
10% of 900 = 90
Answer: 90
Viewpoint 2: The playful puzzle interpretation
Imagine 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 teaser and wants to start a debate, you can smile and say:
“Mathematically it’s 90… but in a weird imaginary world where the whole box is red, it would be 0.”
And that is why even a tiny puzzle about colored balls can create a surprisingly big conversation!
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