This money puzzle says: a man has $100. He spends half of it and then spends another $10. How much money does he have left?
The answer is $40.
Start with $100. Half of $100 is $50, so after spending half he has $50 remaining. Then he spends another $10. That leaves $40.
The calculation is simple: $100 − $50 − $10 = $40.
The puzzle can catch people who rush because the word “half” sometimes makes them try to combine the steps too quickly. The easiest way is to work through the instructions in order: first remove half of the original amount, then subtract the additional $10. Following the sequence carefully gives the correct result.
