The hall of the inn was quiet, and everyone was waiting for Yang Zhi to explain this somewhat perverted topic to them.

Yang Zhi exhaled lightly, tried to relax himself, and said in a deep voice: "This problem is not difficult to solve, I think you should have learned the one-dimensional equation, what this problem seeks is the time to fill with water, so let's make an unknown number to replace this time." And let's assume that the volume of the cistern is 1.

Based on this volume1, we can derive the amount of water to be filled and discharged at each hour.

That is, the amount of water injected per hour is divided by 1 by 5, and the amount of water discharged per hour is divided by 1 divided by 8.

In this way, we can conclude that when filling and discharging water at the same time, the amount of water entering the pool, according to the title, it is not difficult to understand that the speed of water injection must be greater than the speed of water discharge.

That is, when these two are carried out at the same time, the amount of water added to the pool at each hour is one divided by five minus one divided by eight, which is the speed of an hour.

And let's assume that the pool is one.

Multiply this speed by our earlier assumptions to find an equation.

（1/5-1/8）x=1；

”

There was silence in the hall, and everyone was frowning and thinking about Yang Zhi's answer.

Yang Zhi's guards were all reckless men who couldn't read a basket of big characters, and such a difficult question was like a book of heaven to them, and they didn't know whether their young master was right or wrong.

But Chu Xin had already secretly made up his mind to pay attention, if Yang Zhi was ridiculed because he said something wrong, he would definitely knock down the big teeth of the person who was laughing at him.

Therefore, while the candidates were thinking, Chu Xin's tiger eyes stared vigilantly at this group of young people.

Fortunately, his fears did not materialize.

After figuring out Yang Zhi's solution ideas, everyone couldn't help but show a look of admiration, and even more excited students had to talk about wine.

can solve such a complex problem in such a short time, although the young man in front of him is small, he is far superior to himself in terms of knowledge, how can he dare to grow up with a few years older.

However, Yang Hao forbade Yang Zhi to drink alcohol before he became an adult, and although he left the palace, he didn't dare to cross the line at all.

Wanyan rejected the candidates' kindness.

Although this is a bit of a big mess, the optimistic Yang Zhi still quickly talked with this group of candidates.

Yang Zhi grew up in the air since he was a child, and he didn't know much about the accidents in Chang'an.

And these candidates are different, their experience is far more difficult than Yang Zhi's.

During the conversation, Yang Zhi knew that the big black man just now was actually the ninth bull in Jingzhou this year, which made him a little surprised.

From the outside, this person is at least in his twenties, but after asking, he learned that this guy is only seventeen years old this year.

Such a anxious appearance made Yang Zhi snicker in his heart.

However, although he thought it was funny, he was still extremely sympathetic to this person's experience.

In the conversation, the black man said that his name was Yunfeng, many years ago he was originally a slave of the merchant, if nothing else, his fate was to be dismantled by the merchant as a human sacrifice, fortunately, the merchant provoked the Qi State without knowing whether he was alive or dead, and was wiped out by the Qi State in a rage, and their slaves were liberated.

It's just that Yun Feng, who was still young, followed his sick mother all the way to Xincheng and became a savage of Qi State, and later the imperial court set Xincheng as the county seat and set up a school.

And a child like him, who has no ability to work, was forcibly sent to the school.

Later, he heard that as long as he studied hard, he could become a distinguished official, so in his spare time, he helped his mother take care of the few acres of thin fields and two young siblings.

However, in the winter of the ninth year of Hongwu, his mother died because of her frail health after so many years of hard work in the Shang tribe.

At that time, he had just been lucky enough to enter a newly established secondary university.

The departure of his mother left the family's livelihood on him, which made him want to give up his studies for a while.

It's just that in their town, he was the first student of a secondary school, so the mayor of the town deliberately went to Liexin County, and became the county magistrate, for a person like him who is not yet an adult, has no father or mother, and is still very good at school, the county order made a special exception, like a letter to the imperial court, asking for special care for such students.

The imperial court came down to approve the document to provide some living expenses for students who are very difficult and have excellent grades, although this money is not much, but at least it can give their three brothers and sisters a bite to eat.

In this way, it took two years to complete the secondary school and won the qualification for the imperial examination with a score of ninth.

After Yang Zhi listened, he suddenly felt deep admiration for Yun Feng.

He knows a little bit about the bursary.

In his opinion, that money can be eaten in Chang'an City, and Yun Feng actually fed the three of their brothers and sisters, although Yun Feng said it easily. But Yang Zhi can imagine how difficult his life has been in the past few years.

Thinking of his once luxurious life, Yang Zhi couldn't help but feel a little embarrassed.

He has some much better material conditions than these people, and just now he became complacent because he made a topic that no one else had done, which made him feel a little ashamed.

If they have the same conditions as themselves, or even worse, how can they be opponents based on their level of effort.

Yang Zhi began to reflect on his past, and felt that it was good for him to come out this time, although he had just left Chang'an City, he really felt the difficulties of ordinary people.

Letting go of the burden of identity, Yang Zhi gradually mingled with this group of people, and even took the initiative to share his knowledge with these candidates.

In the process of learning and communicating with each other, the atmosphere of this hall is very lively.

It has become an academic discussion event.

Some of them talk about the magical natural sciences, and some of them write beautiful articles, and the enthusiasm of this group of young people continues unabated until late at night.

Seeing this, the shopkeeper in charge of running the inn took out the precious candles for the first time for the group of young people who were scolding Fang Yu to talk indulgently.

Knowledge is an incomparably sacred thing in the Qi country, and even a farmer who can't read big characters will instinctively give enough respect to intellectuals.

It's just that Yang Zhi or his guards don't know that in a corner of this inn, two mysterious people are watching Yang Zhi's every move.

Later night, after the crowd dispersed, the two men also quietly hid into the darkness.

A few days later, all of Yang Zhi's whereabouts were presented in front of Yang Hao's case.

After Yang Hao saw it quickly, he smiled with satisfaction.

Although he allowed Yang Zhi to travel, as a father, how could he really rest assured that his children were traveling in this not peaceful world.

At the same time that Yang Zhi left Chang'an, the master of Jinyiwei had been secretly following his footsteps.