Qin Feng was a little speechless. How could he just apply a method that he had learned without considering the actual situation?
However, this era had some limitations, so it was reasonable that these people couldn't think of it.
Everyone, including Li Er, focused their gazes on Qin Feng. It seems that everyone is interested in this question and wants to know how to solve it.
Qin Feng still couldn't answer them according to the method of solving the linear equations of three variables. He could only say,"Four roosters are worth twenty copper coins and three chicks are worth one copper coin. The total number of chickens is seven and the money is twenty-one copper coins.”
"As for seven hens, the chicken count is seven, and the money is also twenty-one wen. If he bought seven fewer hens, he could use the money to buy four more roosters and three more chicks.”
"How about this, a hundred chickens are still a hundred chickens, and a hundred coins are still a hundred coins. Therefore, as long as one answer was found, other answers could be found immediately according to this algorithm.”
"Do you understand what I mean?" Qin Feng asked after he finished speaking.”
Lu Youjun thought to himself thoughtfully, and a flash of inspiration flashed in his mind. It was as if he had caught onto something, but it also seemed as if he had not caught onto anything.
Qin Feng didn't expect them to understand after explaining it once. After all, even the method he used to explain it wasn't something that ordinary people could understand.
Even Lu Youjun, who was familiar with the Bright Arithmetic Department, found it difficult to accept two new methods at once, let alone the officials who rarely came into contact with the Bright Arithmetic Department. They all chose to give up.
Even two questions couldn't stump Qin Feng, Lu Youjun was still unwilling, as if he somewhat understood Wang Jingzhi's feelings just now.
Letting out a long breath, Lu Youjun said,"Today, there is a question. From the beginning, what is the number obtained by adding up to 100?”
This question had never been seen in various mathematics books before. By chance, Lu Youjun thought of this question.
At that time, Lu Youjun spent more than a day to calculate this number. During this period, he also made several mistakes. Every time he made a mistake, he had to start over again, almost making him give up.
Fortunately, he persevered and finally calculated the result. He also used a day to verify it. It could be said that he could be invincible with this question.
"The number obtained is five thousand and fifty.”
However, what made Lu Youjun unable to believe was that Qin Feng still answered without hesitation.
Qin Feng had been in contact with this kind of question from 1 to 100 since elementary school. He had even used an abacus to calculate it in elementary school.
However, there was no need to use an abacus to calculate this question bit by bit. From one to one hundred, it could be regarded as a set of arithmetic progression. Using the arithmetic progression sum formula, the answer could be easily calculated.
As the others had never come across such a question before, just listening to it was already very troublesome. If they added a hundred numbers together, the slightest mistake would make all their previous efforts go to waste.
They had already completely treated themselves as spectators, wanting to see how Uncle Lan Tian would be stumped.
However, Uncle Lan Tian continued the style of the first two questions and answered them without hesitation. Moreover, he gave the correct answer.
This question obviously couldn't be solved by whistling and lifting his legs, nor could it be solved by changing between the old chicken, the young chicken, and the mother chicken. Could it be that there was a new method?
Lu Youjun was puzzled and could not help but ask,"Hmm? How should I solve this problem?"
Qin Feng definitely couldn't start from the arithmetic progression, so he said ambiguously,
"As the old saying goes, the master leads the way, but the cultivation depends on the individual. Today, I have already taught you two methods. The rest will depend on your own comprehension.”
Uh, Lu Youjun really wanted to say," Students can't do it!”
This question might not be solved even if he thought about it for ten days to half a month. However, since Qin Feng had already said so, Lu Youjun was too embarrassed to ask again. He wanted to take advantage of Qin Feng's presence to ask some other questions.
Qin Feng also saw that Lu Youjun wanted to ask more questions. He didn't want to waste time on these questions that were similar to the elementary school Mathematical Olympiad questions, so he decided to take the initiative and strike first.
"Wait, since you've asked me three questions, I'll ask you one. How about it?" Qin Feng said.”
Lu Youjun's eyes lit up. He guessed that Qin Feng's question would definitely be challenging, so he said boldly,"Just say it."
"They said that three people went to the inn to stay in three rooms. Each room cost ten wen, so they paid the shopkeeper a total of thirty wen.”
"The next day, the shopkeeper said that three rooms only cost twenty-five wen, so he asked the waiter to return five wen to the three guests.”
"Who knew that the waiter was greedy and only returned one copper coin per person while he secretly took two copper coins. This is equivalent to the three guests spending nine copper coins each, so the three of them have a total of twenty-seven copper coins.”
"And the waiter only has the two wens he took all by himself. Adding on the twenty-seven wens, there's a total of twenty-nine wens. However, the three customers paid a total of thirty wens at the beginning, so where did that one wens go?”
This time, Qin Feng's question sounded normal and could be said to be without any fancy words. However, every sentence was very reasonable. Why did that one coin disappear?
The simpler the question, the more confused it was. No matter who was present, they all felt that their brains were not enough.
Qin Feng couldn't help but laugh. This question looked very simple at first glance, but in reality, it wasn't easy to answer. At least, they wouldn't be able to answer it even if they were given a month's time.
Actually, Qin Feng still had a lot of questions. For example, the famous Newton's problem, which was a question about cows eating grass. A group of cows eating grass in a pasture, the growth of grass was uniform, and the amount of grass eaten by the cows was also constant. He asked how long it would take for them to finish eating the grass.
They would probably have to solve these questions for the rest of their lives.
As expected, after Qin Feng asked, Lu Youjun began to count with his fingers. However, his worried expression proved that the situation was not optimistic.
When the two sides compared, the difference was immediately determined. Qin Feng was able to answer Lu Youjun's question right after he finished, while Lu Youjun was still thinking hard.
Therefore, Qin Feng won the test against the Five Surnames and Seven Wangs.
After two consecutive victories, Qin Feng gained a lot of respect. Some people even started to support him.
On the other hand, the Five Surnames and Seven Wangs had returned in defeat after two rounds. Wang Jingzhi was like a frosted eggplant now, and Lu Youjun was racking his brains, scratching his ears and cheeks.
Lu shi and Wang shi were completely defeated in this exam, losing their previous arrogance.
Next, the Five Surnames and Seven Wangs sent out the younger generation of the Cui clan, Cui Chihao.
Although Cui Chihao wasn't the most outstanding person among the younger generation of the Cui family, he was still considered one of the best. Moreover, he usually kept a low profile. Only the Cui family knew about his background.
There were only three rounds of examinations today and Qin Feng had already won two. However, the Five Surnames and Seven Wangs could not let this matter rest. If they lost one out of three rounds, it would be a huge blow to their prestige.
Therefore, they had to win the last round of the exam.
The last exam was the Ming Jing subject. The Ming Jing subject was also an exam subject. The Ming Jing subject examined the classics and current affairs.
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