Fall down where you don't expect to

Hart practiced mental arithmetic under the guidance of his father since he was a child. After years of hard training, he finally became an excellent mental arithmetic master. He was able to say the correct answer right after the other person had just said the number to be calculated. Even in the face of particularly difficult mixing operations, Hart never showed any deviations. For this, Hart is very proud. He is also often invited by various places to perform mental arithmetic performances. No matter where he goes to the show, Hart has never been frightened, and has been for decades.

This time, he also confidently stood in front of the stage to perform mental arithmetic. Most of the people in the audience came with small computers. On the one hand, they wanted to verify Hart's mental arithmetic skills, and on the other hand, they wanted to perceive which of the human brain and the computer responded faster. During the performance, one by one, people took to the stage to pose questions for Hart. The people who came up to the stage tried their best to come up with more complex calculations and larger numbers. Obviously, they were both impressed by Hart's mental arithmetic skills and unexpectedly stumped the mental arithmetic master who never made mistakes. . But none of them stumped him. Hart was even more pleased when he saw them walking down the stage convincingly one by one. Just as Hart was feeling complacent, another woman came up on stage. The lady was not very good-looking, but the expression on her face was serious. Seeing this lady, Hart thought: "The one in front of me must be trying to stumped me again, but this is just a game, why take it so seriously?" The lady slowly said the content of the topic to be asked.

There is a train going to a certain place, a total of 6089 people get on the train at the starting station, 22 people get off at the first station, 84 people get on the train; 13 people get off at the next station, and 61 people get on the train. people. "

Hearing this, Hart couldn't help but chuckle in his heart, "Such a simple addition and subtraction problem is really childish."

The lady was still talking about her topic in a leisurely manner, "The next stop dropped 48 people and boarded 39 people; the next stop dropped 64 people and boarded 76 people; the next stop dropped 94 people. 77 people got on; 59 people got off the next stop, 162 people got on; 195 people got off the next stop, 67 people got on." Speaking of which, the lady stopped for a while, and Hart was determined to win But he was willing to pretend to be modest and say to the lady: "You can still ask questions, do you have any more?"

The lady still had an unhurried and serious look, she said, "Of course, the train keeps moving forward, and at the next stop, 295 people go down and 24 people come up; 82 people go down to the next stop, and 35 people come up. , 673 people go down to the next stop, and 15 people come up."The lady paused again, at which point Hart wished she could say something more difficult, since hers hardly allowed Hart to fully express his mental arithmetic abilities. But Hart, still being quite polite, said to the woman, "If the question ends here, I think I can say how many people are left on the train now. Are you finished?" The lady looked at Hart and said, "Only the last sentence left," and then said aloud, "I'm asking how many stops this train has made along the way, not how many people are left on the train." Hearing the lady's last words, Hart was at a loss for words. Why has the wind and waves passed smoothly, but the boat often capsized in the small sewer? The reason is not the environment itself, but people's attitude towards the environment: in the face of strong winds and waves, people will concentrate and concentrate, but they are a little less careful and more careless about the small sewer.