Not only was Changlu shocked, but the surrounding scholars also stopped writing and looked at Lin Yun in surprise.

Changlu smiled and said: "Sir Lin, since you are so confident, then explain this problem to everyone."

Lin Yun stood up and answered: "This question is very simple. As long as the chicken and rabbit lift two feet at the same time, the chicken will lie on the ground, and the rest will be the rabbit's feet. We divide it by two, and what we get is the rabbit's feet.

The number is seven. Then subtract seven from twenty, and there are thirteen chickens.”

After Changlu heard this, his expression changed drastically. He pinched his fingers and counted silently in his mind.

The scholars looked at Lin Yun in confusion, wondering what he was talking about.

After a while, Changlu asked Lin Yun: "Did you research this solution?"

Lin Yun shook his head and said, "No, I read it in a book."

Changlu asked hurriedly: "Where is the book?"

"Lost."

When Changlu heard that it was lost, he immediately cursed bitterly: "Ignorant young man, how could you lose such a wonderful book so easily."

A scholar asked: "Master, chickens and rabbits can't understand human speech. How can they lift their feet?"

Changlu scolded: "Idiot, that is just a comparison. Lin Shizi wants to tell everyone, first remove forty feet according to the number of heads, and the rest will be all rabbit feet. Then divide by two, that is

The number of rabbits can be deduced in this way, and the number of chickens will also come out."

Ding Yuannan slapped the case and shouted: "I understand, classmate Lin really thought of a good and interesting solution. With this solution, similar arithmetic problems can be solved easily in the future."

Changlu: "That's exactly it."

After finishing speaking, he asked Lin Yun: "There are pheasants and rabbits in the same cage today. There are thirty-five heads on the top and ninety-four legs on the bottom. What are the pheasants and rabbits?"

Lin Yun thought for a while and said: "There are twenty-three chickens and twelve rabbits."

Ding Yuannan smiled and said: "I also calculated it, and classmate Lin's answer is completely correct."

Ning Yue also said happily: "Master, I have also solved it. This problem will no longer be difficult in the future."

Only then did Lin Yun notice this young man named Ning Yue. He was slightly older than himself, with a slender figure and an appearance that rivaled that of Jia Lian. He was a typical handsome man.

Seemingly noticing Lin Yun looking at him, Ning Yue turned her head and smiled at him.

Just when Lin Yun was curious about Ning Yue, Changlu came over and smiled at him: "Sir Lin, I have another question here, you can try to solve it."

"Won't."

Before Lin Yun could wait for Chang Lu to say the topic, he rejected the other party's question. He was very unhappy with this fat head and had no intention of satisfying the other party's inquiring mind.

Changlu was not upset after being rejected by him, but said cheerfully: "If you can solve this problem, I can let you use the bedding you brought."

Lin Yun was overjoyed when he heard this, and he hurriedly said: "Sir, please come up with a question."

Changlu: "Today there is a wall five feet thick, with two rats passing through it. A rat's day is one foot long, and a mouse's day is also one foot long. A rat's day is twice as long, and a mouse's day is half a foot long. When we meet on what day, how much do each of them pass through?

"

Lin Yun thought to himself: "Isn't this a question from Chapter Nine of Arithmetic? Is this guy trying to test whether I have read Chapter Nine of Arithmetic?"

He picked up the brush and wrote on the paper. He quickly put down the brush and said with a smile: "The answer is that the big mouse met in two days, two hours, forty-nine minutes and fifty-two seconds. The rat walked through the wall three feet and four feet."

An inch is seven points, and a mouse can pass through a foot and five inches of a wall."

As soon as Lin Yun finished speaking, Ding Yuannan clapped his hands and praised: "It's perfect. Lin Shizi must have read the nine chapters of arithmetic, right?"

Lin Yun nodded and said: "I didn't read it carefully, I just flipped through it casually."

Changlu held the manuscript paper written by Lin Yun, and felt as if boiling water was boiling in his heart. This little guy could solve the obscure arithmetic problems in nine chapters with such simple calculations. He was clearly an arithmetic genius.

Thinking that he might have discovered an arithmetic genius, the old man's cheeks turned red with excitement and he wanted to run immediately to tell the mountain leader Lu Xingzhi the good news.

However, he finally suppressed the urge in his heart and began to teach the scholars.

Lin Yun listened carefully and realized that what Chang Lu was talking about was probably arithmetic problems for elementary school students. In this era when arithmetic is not taken seriously, it is already very difficult to teach these things.

Although he was not interested in the content of Changlu's lectures, Lin Yun still listened attentively. He felt that things like those taught at Yichen Academy were hundreds of times better than studying those classics and articles. Anyone who could pursue arithmetic could do it.

Worthy of respect.

…

In the elegant interior of Shan Chang Lu Xingzhi,

After taking Lu Xingzhi's pulse, the old miracle doctor wrote a prescription while admonishing him: "Come on, you old stomach-sick person can't stand the cold. I advise you to build a heated kang in your house."

Lu Xingzhi shook his head and said, "Scholars and other lecturers are all like this, how can I be an exception?"

"Aren't you asking for trouble?"

Lu Xingzhi smiled and did not take up the topic again.

After a moment, he asked again: "Old miracle doctor, I heard that Lin Ruhai's nephew is going to marry that girl from the Qin family? Is this arranged by you?"

The old miracle doctor nodded and said: "This is why I came to Beijing this time. Now that the marriage between Yun Boy and that girl has been settled, I can feel at ease."

Lu Xingzhi smiled and said, "You made this arrangement, but you missed that boy's future."

The old miracle doctor smiled bitterly and said: "I was forced to do this, and that's why I took this step. Besides, Mr. Yun is not interested in an official career. It would be good for him to become a rich man in the future."

Lu Xingzhi shook his head and said, "Don't you think you can see the end of the cone immediately when you hear it in the bag?"

The old miracle doctor said doubtfully: "If the emperor refuses to use it, how can he get ahead?"

Lu Xingzhi: "I am a man who cherishes his talent. It would be better if Mr. Yun has no talent. If he is really talented, he will be in a dilemma for your majesty in the future. Whether he uses it or not, it will make it difficult for your majesty. This is what the old genius doctor said today."

It’s too late.”

The old miracle doctor hurriedly said: "When this matter is over, I will take Mr. Yun back to Yangzhou. The situation you are worried about will not happen."

Lu Xingzhi laughed and said, "From your words, I can tell that that little guy must be no ordinary person."

As soon as he finished speaking, Chang Lu hurriedly opened the door and ran in. He said to Lu Xingzhi in surprise: "Shan Chief, I found an arithmetic genius."

Lu Xingzhi smiled and said, "Changlu, are you talking about that little guy Lin Yun?"

Changlu clapped his big hands and said with a smile: "Chief, you are right. I am talking about Lin Ruhai's nephew. His talent in arithmetic is more than a hundred times better than mine."

"oh."

Lu Xingzhi was stunned by what Chang Lu said. He was very aware of Chang Lu's arithmetic skills. Now he actually said that Lin Yun was a hundred times better than him. That was really surprising.

Changlu: "Chief, I would like to recommend Lin Yunlai to be the academy lecturer and teach arithmetic. What do you think?"

The old miracle doctor interjected from the side: "This is definitely not feasible. Mr. Yun is bothered by these mundane affairs the most. Even if you ask him to be the mountain chief, he will definitely not agree."

Lu Xingzhi: "If you listen to the old miracle doctor, don't force it."

"All right."
Chapter completed!