It sounds like a warm-up question. The kind you'd get in second grade before the real test starts. Most adults answer it in half a second and walk away completely wrong.
"What's the maximum number of times you can subtract five from 25?"
Solution:
Go ahead. Your brain probably already said five. Maybe even said it before you finished reading the question.The answer is one.
Just once. You can only subtract five from 25 exactly one time. Because after that first subtraction, you no longer have 25. You have 20. From that point on, you're subtracting five from 20, then from 15, then from 10. The question asked specifically about 25.
This is the kind of riddle that makes people genuinely annoyed when they hear the answer. It feels like a trick. In a way, it is — but it's also completely logical. The question is technically precise. The number 25 only exists once in the sequence. After the first subtraction, it's gone.
What's interesting is that this riddle exposes something about how we read. When we see "subtract five from 25 five times," we're already doing the problem before we've actually read what's being asked. Speed-reading is a habit, and habits skip details.
It's the same reason people sign contracts without reading the fine print. Our brains are trained to process the gist and move forward. This riddle just holds up a mirror to that.
Slow down. Read the whole thing. The answer was right there the whole time.