Mr Hurley is not complacent. He knew that his achievements could not be separated from Professor Yasen. Hurley turned out to be a poor student, studying hard and having a special interest in mathematics. However, he doesn't even have enough to eat and has no extra money to buy books. So he took the cheapest bread every day and stayed in the library, consulting and copying materials until the library closed. Professor Yasen found him in the library and took him as an apprentice. Under the strict requirements of Professor Yasen, Hurley made rapid progress and achieved today's results.
This afternoon, Mr. Hurley came to Professor Yasen's house with his paper and wanted to ask him to revise it. He rang the doorbell, but no one answered the door. He thought the professor was resting and was about to leave. Suddenly, he found the door open, so he gently pushed it open and went in. There is no one in the empty room, there are many books on the table, and the water in the teacup is still steaming. All indications are that the professor doesn't look like going out. Hurley thought, maybe the professor went to buy bread or cigarettes and forgot to lock the door.
Mr Hurley sat on the sofa, reading the newspaper and waiting patiently. 10 minutes passed, but Professor Yasen still didn't come back. Mr Hurley is a little nervous. What will happen? He stood up and looked at the professor's desk. By chance, he found an arithmetic problem "10 1×5" on the calculator. Mr Hurley wants to know why the professor still uses a calculator to solve such a simple arithmetic problem. He pressed the calculator and the answer appeared on the LCD screen. As soon as Mr. Hurley saw it, he understood it immediately and immediately grabbed the phone and called the police.
Why did Hurley judge that something had happened to the professor after reading the answer?
Result of solving a case
10 1×5=505, "505" is like the emergency distress signal "SOS" on the LCD screen of the calculator, and the professor indicates that he has been kidnapped in this way.