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Wang Mian was the first to figure out the correct answer to the last question, which made him feel proud again.

The questions for the next few people are getting more and more difficult, but Zheng Zhixun, who has been in school for a few days with Yan, feels that the questions that were considered difficult in the past are nothing more than that now.

Arabic numerals, fractions, decimals, and some operations have put him ahead of his peers.

Wang Mian was secretly proud when he saw Zheng Zhixun just sitting there, occasionally sketching on the notebook with his hand, but not answering a single question.

It seems that this guy still hasn't made much progress. I was careless yesterday and fell into his trap. As long as I am more careful next time, there will definitely be no problem.

Finally, it was Wang Mian's turn to pose the question.

Wang Mian smiled proudly, and then said: "There are pheasants and rabbits in the same cage today. There are 35 heads on the top and 94 legs on the bottom. How many pheasants and rabbits are there?"

This "chicken and rabbit in the same cage" is the title of a book called "Sun Zi Suan Jing" that the Wang family recently collected for him. Even his learned husband has never read this book and concluded that it should be like this. More than 100 years after it was written, it has not been widely circulated.

Equation problems that would be nothing in later generations, in this era, stumped the rich second generation who studied arithmetic.

One by one, they took paper and pen and started planning.

Wang Mian felt complacent, but when he saw Zheng Zhixun motionless, he became angry.

For the question I asked just now, this guy at least used a pen to draw a few strokes on the paper. Although it looked like ghostly drawings from a distance, at least he still started writing.

When I got here, this guy didn't even hold a pen. Isn't this a sign of looking down on others?

"Zheng Zhixun, don't go too far!" Wang Mian slapped the table and pointed at Zheng Zhixun: "What is the purpose of our arithmetic society? Since you came today, you have always acted like it has nothing to do with you. If so, don't do it in the future. coming."

He felt that whatever he said was reasonable, and as soon as he finished speaking, it could be seen in the eyes of several other people that they clearly supported him.

"Brother Wang, your question is too easy!" Zheng Zhixun shrugged and said, "I have already calculated the answer, so why do I need to calculate it again?"

"Impossible!" Wang Mian said. The Sun Tzu Sutra is an only copy, and he only has one copy in his hand. How could Zheng Zhixun know the answer?

And can you get the answer just by doing mental arithmetic without using pen and paper or calculation chips? Absolutely impossible!

"Hey, Brother Wang, look, there are 35 heads now, that is, 35 animals, right? You just need to ask all the animals to lift their two feet. Doesn't the chicken have no feet? Each animal lifts its feet. It has two legs, making a total of seventy legs. The remaining 24 legs are naturally those of rabbits."

"There are two rabbits in each of these 24 feet, so naturally there are twelve rabbits. If there are twelve rabbits, then there will naturally be 23 chickens!"

After saying this, not only Wang Mian was dumbfounded, but also the entire people on the third floor of Xiyue Building who came to participate in the arithmetic society were dumbfounded.

When doing math problems, can you still ask chickens and rabbits to raise their feet? What is this?

But then again, although Zheng Zhixun's method sounds nonsense, the truth is correct. After getting the answer, they went back and found that it was indeed twelve rabbits and 23 chickens!

For a moment, the atmosphere began to become subtle.

"You...you...how do you do the math like this?"

"Why can't I do math like this?" Zheng Zhixun raised his eyebrows and said, "Mathematics is just a tool for us to solve problems in the world. Ultimately, our goal is to solve problems. To dig a hole on the ground, a knife can dig it, a shovel can dig it, that's it. You can dig with any stick, as long as you dig out a satisfactory hole in the end."

In fact, this question was asked by Yan Kai to ask him to learn equations. At that time, Yan Kai also used the method Zheng Zhixun mentioned at the beginning.

At that time, Zheng Zhixun was also very confused and asked similar questions to Wang Mian. This is how Yan Kai educated him.

"You...you..." Wang Mian was so confused by Zheng Zhixun's words that he didn't know how to refute, so he could only say: "Then tell everyone your question!"

"Okay!" Zheng Zhixun nodded and said: "Wang Er sells soybeans. The purchase price is 180 Wen and the selling price is 210 Wen. Zhang San holds one tael of silver to buy soybeans. Wang Er doesn't have enough money, so he exchanges the silver with Li Si for thousands of Wen. A total of 790 coins were returned to Zhang San. However, after Zhang San left, Li Si discovered that the silver was fake and asked Wang Er how much money he lost?"

"Hmph, I don't have to do the math for your question!" Wang Mian said: "Wang Er compensated Li Si with 180 yuan, plus he lost 180 yuan in soybean purchase price, so of course it's [-] yuan!"

Zheng Zhixun smiled slightly: "Wang Er got a thousand real money from Li Si and gave 790 real money to Zhang San, leaving 210 real money left. When he returned it to Li Si, he only used the 790 more real money he gave to himself. That’s fine, how do you calculate the compensation to Li Si’s [-] yuan?”

"Uh..." When Wang Mian heard this, it seemed to make sense.

There were several people who had the same idea as Wang Mian, but upon hearing this, they began to be confused.

Some began to pick up pens and check calculations on paper.

Some started to discuss it in pairs.

Wang Mian thought about it over and over, and the more he thought about it, the more he thought about it. Finally, he had no choice but to sit down and start to check the calculation.

Zheng Zhixun looked at them as if he had seen himself a few days ago. The old god waved to Dr. Tea from Xiyue Tower to come over and pour him a cup of tea.

But Yan Kai refused. The tea in Xiyue Tower was boiled and he couldn't drink it.

Within a moment, someone shouted that he had figured it out, but the answers between the several people were completely inconsistent, so the quiet third floor of Xiyue Building started to quarrel again.

Several of them were arguing with each other, but no one could convince the other.

"Why are you making so much noise here in public?" At this moment, the door of their private room was pushed open, and a bearded man stood at the door and asked.

"Who are you? Do you care if we are discussing arithmetic problems here?"

"Hey, your Grandpa Cheng will let you know today, whether I can control it or not!" The bearded man rolled up his sleeves and was about to come in.

"Old Cheng!" The voice coming from behind him gave him a pause, then he stepped aside, revealing a middle-aged man with extraordinary valor.

"I'm sorry, my companion is a bit impatient. When I walked by just now, I heard you talking about losses and gains. I wonder if you can tell me what the problem is?"

Although the middle-aged man was dressed in ordinary clothes, his bearing was really extraordinary. These young men from aristocratic families were also discerning. Fan Hao stood up and introduced Zheng Zhixun, and then told him the topic he just mentioned.