At a local bar, three friends, Mr. Green, Mr. Red and Mr. Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. "Have you noticed," said the man the blue suit, "that although our suits have colors corresponding to our names, not one of us is wearing a suit that matches our own names?" Mr. Red looked at the other two and said, "You're absolutely correct." What color suit is each man wearing?
Since none of the men are wearing the color of suit that corresponds to their names, and Mr. Red was replying to the man in the blue suit, it had to be Mr. Green to whom he replied. We then know that Mr. Green is wearing a blue suit. Therefore, Mr. Red is wearing a green suit and Mr. Blue is wearing a red suit.
Con cua cà mau đỏ chạy đua với con cua cà mau xanh. Con cua đỏ có chiều dài càng là 3cm, chân dài 5cm. Con cua xanh có chiều dài càng là 2cm, chân dài 4cm. Tuy nhiên con cua đỏ bị mất 2 cái chân. Hỏi con cua nào chạy nhanh hơn?