Ling Wudao had a faint smile on his face, like a benevolent elder. He looked harmless, but Yang Xuan believed that if he showed the slightest intention of escaping, he would be met with a thunderous attack.
If he was alone, he could give it a try and see the power of half-step human dao, but he had Meng Qingqing behind him.
Meng Qingqing cleverly remained silent. Although she didn't know why Ling Wudao addressed Yang Xuan as Mr. Ren, she knew that keeping her mouth shut was the best choice.
"I'll do as you say!" Yang Xuan muttered to himself before cupping his hands.
Ling Wudao revealed an extremely gratified expression and said with a smile, "That's great. Mr. Ren, please!"
"Please!" Yang Xuan replied.
Yang Xuan returned to his old haunt after a short while. This time, he didn't have to be sneaky, but he still couldn't see the entire Biyun Sect. It was as if the entire valley was shrouded in a layer of fog.
"Mr. Ren, please!" Ling Wudao landed first and stood at the door when they arrived at a large hall.
Yang Xuan and Meng Qingqing also landed and followed Ling Wudao into the hall.
After the host and guest were seated, a servant served tea to the three of them.
Ling Wudao glanced at Yang Xuan and suddenly smiled. "Mister Ren, to be honest, I've done some research in mathematics as well. However, compared to you, I'm naturally far behind."
Yang Xuan couldn't guess what he was up to. He smiled and said, "Senior Ling is too polite. Mathematics is broad and profound, and I've only dabbled in it. It's really not worth mentioning."
Ling Wudao laughed heartily. "Mr. Ren, you don't have to be modest. I'm really interested in the method of measuring. I wonder if you can explain it to me?"
Yang Xuan's heart shook as he muttered to himself: Here it comes.
He was also very curious. Why was Biyun Sect so interested in this?
However, he had already told Zhang Heng and the others about similar shapes, so it wasn't a big deal. After pondering for a moment, he explained to Ling Wudao in detail about similar shapes.
After he finished speaking, he saw Tyrannical's expression change.
Wudao's face was originally calm, but now it was filled with uncontrollable excitement.
"Mister Ren, please wait for a moment. There is a person in Biyun Sect who is a master of mathematics. I believe that you and he will definitely hit it off well."
Without waiting for Yang Xuan's reply, he walked out of the room.
At this time, only Meng Qingqing and Yang Xuan were left in the hall. Meng Qingqing looked at Yang Xuan and asked, "What should we do?"
Yang Xuan shook his head, indicating for Meng Qingqing to remain calm and act according to the circumstances.
Although Meng Qingqing was sometimes a little unruly, she knew that the two of them were already forced into this situation. She glanced apologetically at Yang Xuan and moved her lips slightly.
Yang Xuan took a quick glance and knew what she was talking about.
Meng Qingqing was saying, "You don't have to save me."
Yang Xuan smiled and shook his head, but didn't say anything.
Meng Qingqing still wanted to say something, but she suddenly shut her mouth. The next moment, Ling Wudao led a person in.
It was an old man with messy hair. His eyes were sunken and red, and the beard under his chin was already stuck together. It looked as if he hadn't taken care of it for a long time.
"Mister Ren, this is Elder Xie Tianji of Biyun Sect. Elder Xie, this is Mister Ren."
Yang Xuan was shocked. Ling Wudao was already the deputy sect master, second only to one person. The importance of someone who could be addressed as Elder Xie was self-evident.
He sharply sensed that this Elder Xie was probably a very important person in Biyun Sect.
"Public morals are degenerating day by day. Can any random person be called Mister?" Xie Tianji blinked his little eyes and looked at Yang Xuan in disdain. Then, he turned to Ling Wudao and said, "Wudao, you too. My time is so precious, where would I find the time to waste?"
Ling Wudao smiled awkwardly at Yang Xuan. Then, he said to Xie Tianji, "Elder Xie, this Mister Ren is a great talent. When the Moon Appears was written by Mister Ren."
Xie Tianji sneered. "It's just playing with words. Since ancient times, there has been no good literati. The better the literary talent, the more worthless they are."
Yang Xuan was a little speechless. This old man with the surname Xie didn't seem to have a good impression of literati. He kept saying that they were worthless, but Yang Xuan really wasn't a literati. He was really wronged.
Ling Wudao shook his head helplessly. "Elder Xie, Mister Ren also has profound attainments in the field of mathematics. He should be of some help to Elder Xie's research."
Xie Tianji was slightly taken aback. Looking at Yang Xuan, he snorted disdainfully. "The art of mathematics is broad and profound. Don't tell me that just because some random cat or dog popped out of nowhere and knows a bit of accounting, they can claim to be proficient in mathematics?"
Ling Wudao was speechless. He looked at this stubborn old man helplessly.
Yang Xuan smiled and suddenly said, "It seems that old Xie's attainments in the art of divination are not shallow. I would like to seek some pointers from old Xie."
He had already sensed that his and Meng Qingqing's safety would most likely fall on this arrogant Xie Tianji.
Xie Tianji looked at Yang Xuan with his nostrils and said, "Want to test me? Kid, you're not qualified. "
Yang Xuan thought for a while and suddenly said, "Elder Xie, I have a question. Today, there is a wall five feet thick. Two mice pass through each other. The big mouse passes one foot while the small mouse passes one foot. The big mouse passes one foot while the small mouse passes one foot. When will they meet? How many times will they pass through each other? "
This question was a question in the "Nine Chapters of Arithmetic". It meant that two mice pass through a wall five feet thick at a speed of one foot per day. The big mouse is strong and its speed doubles every day while the small mouse lacks stamina and its speed halves every day. Ask them when they will meet and how many feet will they pass through each other?
Xie Tianji was slightly stunned. Then, he smiled and said, "This question is interesting. But if you're only at this level, you're just so-so."
Then, he squatted down, took out a piece of powder from his pocket, and started to write and draw on the bluestone floor.
After a long while, he stood up and said, "This question is also interesting. Two days and seventeen times. When the two mice meet, the big mouse passes three feet and seventeen times and the small mouse passes one foot and seventeen times and nineteen times. I wonder if my answer is correct?"
Meng QingQing opened her big watery eyes as if she was listening to a heavenly book. She understood every word that Yang Xuan and Xie Tianji said, but when they were put together, she had no idea what they meant. It was as if she was listening to a heavenly book.
Ling Wudao was slightly better. In the end, he heard Yang Xuan's question clearly. However, his brain was still a mess, not to mention solving the question.
Hearing Xie Tianji's answer, Ling Wudao's gaze immediately fell on Yang Xuan.
Yang Xuan was in awe.
Even if he used modern methods to calculate this question, it would take him a lot of effort. However, Xie Tianji drew some symbols on the ground that he did not recognize. In just a moment, he was able to get the correct answer. It was simply inconceivable.
At this moment, he immediately understood that this Xie Tianji was probably one of the rare mathematicians in this world.
Xie Tianji saw Yang Xuan's surprised face and smiled proudly, "You can ask such a mathematical question. It seems like you do have some attainments in mathematics. Since that's the case, listen to my question too."
Xie Tianji opened his mouth and said, "Today, there are things that I don't know the number of. Two out of three is left; three out of five is left; two out of seven is left. What's the number of things? "
Yang Xuan was slightly stunned. A question about things that I don't know the number of things? That's something.
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