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並前往https://puzzling.stackexchange.com/questions/61006/how-to-prove-that-this-man-has-a-profit-of-20-and-not-10

How to prove that this man has a profit of 20 and not 10?

Yes, this is the mathematics of the riddle. But he rejects it because in his logic he still clinging to the "disappearance of 10 dollars profit" ...

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