The time for the selection of horses was set before the Yuan Dynasty meeting, that is, on the thirteenth and fourteenth days of the first month.

Since it was decided that he was going to choose a colt, Lu Dongzan had not shown up until he chose a colt, and he didn't know what he was plotting. However, this does not affect the normal progress of the pony selection.

On the thirteenth day of the first lunar month, Comrade Li Er took Empress Changsun and hundreds of civil and military officials to wait in the Taiji Hall early, while Princess Gaoyang was secretly observing behind the Taiji Hall accompanied by Li Lizhen.

"How is it, Gao Yang, have you taken a fancy to our Datang talents?" Li Li said with a smile.

"What kind of talents are they there, they all rely on the merits of their fathers, who knows if they have real skills." Gao Yang also poked his head out and looked at the people standing in the main hall.

The foreign envoys were directly ignored by Gao Yang, and they were not within Gao Yang's choice.

This time, under the instruction of Comrade Li Er, there were also five people who came to participate in the selection of horses: Cheng Huaimo, Li Dejian, Li Chongyi, Wei Chi Baolin, and Du He.

Comrade Li Er sent so many second generations, and he really wanted to marry Gao Yang, after all, Gao Yang was a representative who was not easy to manage in Li Er's eyes, so being able to marry Gao Yang earlier and make a good family was also a matter of Comrade Li Er's heart.

"Ladies and gentlemen, today is the day to choose a horse, I won't say anything superfluous, I just hope that no matter which of you or the envoys of that country wins the favor of the princess, you can treat my princess well." Li Erdao.

"The exam questions for choosing a colt are made by the princess herself, and if you can answer the exam questions from the princess, then you can be regarded as my Datang colt, okay, Qingquan, you start testing them." After Li Er finished speaking, Zhang Nan, who was dressed in an official robe, stood up.

In fact, Zhang Nan didn't want to put on his official robe directly without such a face, after all, he had only resigned for a long time, but Li Er didn't seem to continue to pursue this issue, and he also gave him such an important job as choosing a horse, and Zhang Nan couldn't continue to hold the shelf, so Zhang Nan once again put on his official robe.

After all, he is also a nominal colt now, so Zhang Nan can't come out in a cloth suit to preside over such an event.

And all the exam questions this time were handled by him, although Comrade Li Er gave Gao Yang the right to write the questions, but Gao Yang was full of methods for the whole person, and she really couldn't do it if she wanted her to make the questions difficult for the envoys of various countries.

So Gao Yang remembered Zhang Nan, but Gao Yang didn't want to tell Zhang Nan clearly, so Gao Yang asked Li Liqian, who had lived in Zhang Nan's mansion for a while, to give it to Zhang Nan.

However, Zhang Nan is very generous, after listening to Li Lizhen's request, Zhang Nan agreed in one mouthful, after all, no one is better at this kind of thing than Zhang Nan, as Zhang Nan, who understands various examination methods in later generations, it is not too easy to come up with a few questions to test the ancients.

Looking at the envoys with big eyes, Zhang Nan said with a smile: "Everyone, I will read this exam question to you today, I hope you will work hard to answer, the first exam question from this princess is an arithmetic question, presumably all the envoys are familiar with arithmetic." ”

After listening to Zhang Nan's words, the envoys of various countries all nodded in unison, mathematics can be said to be a discipline that has existed since ancient times, and can act as a figure like an envoy, and their brains are generally very bright, so they are really confident in arithmetic for them.

And Lu Dongzan is even more like a middle-hearted look, as the great treatise of Tubo, Lu Dongzan must keep in mind the affairs of Tubo, especially the expenditure of the treasury, Lu Dongzan is also responsible, so on weekdays, Lu Dongzan deals with the most numbers.

Lu Dongzan didn't think that the princess of the Tang Dynasty, a female stream, could come up with such difficult arithmetic problems.

"Please ask the adults to come up with the question." Lu Dongzan said with a smile.

"Okay, it seems that you are already confident, come and give the pen and paper to everyone who comes to choose the horse, you can record my question on paper, and the time for answering this question is tentatively set for an hour." Zhang Nan said.

After listening to Zhang Nan's answering time, the smiles on the faces of the envoys became even brighter, and an hour was used to solve an arithmetic problem, and they felt that it was too simple.

And Comrade Li Er sat on it and looked at the envoys who were smiling like flowers below, Comrade Li Er also shook his head in his heart for those people, Zhang Nan's exam questions Li Er has seen it, and Li Er has not made this first arithmetic question, not to mention that there are more difficult questions behind.

"Alright, that's about to start, everyone, please listen to the question."

"A shop that sells liquor can sell 30 bottles of daughter red every day, and earn 50 wen per bottle, in order to expand sales, increase profits, and minimize inventory, the restaurant decided to reduce the price, if each piece is reduced by one penny, the restaurant can sell two more bottles a day, if the restaurant earns an average of 2,100 wen a day, ask the daughter how much the price is reduced. Okay, that's the question, please answer, the first one to answer is the winner. ”

After Zhang Nan finished speaking, he took the hourglass that the palace people had already prepared, turned the hourglass upside down, and signaled that the answer began. And everyone who wrote down the topic on paper began to think about it.

Not only the envoys who were present for the exam, but even the officials of Datang whispered on the side and began to discuss how much the price of this daughter Hong would be reduced.

And Zhang Nan looked at the sweating envoys in the audience, and a smile unconsciously appeared on his face.

"Let's do it, I don't believe that in such a short period of time, anyone can make this problem using a quadratic equation." Zhang Nan said silently in his heart.

Sure enough, when the last grain of sand of the hourglass fell, there was still no one in the field who solved the problem involving a one-dimensional quadratic equation.

"Okay, that's the end of the answers, everyone, hand in the papers, don't forget it." Zhang Nan said with a smile.

Hearing Zhang Nan say this, the rest of the people put down the brush in their hands, and only Lu Dongzan was left, and he was still frantically writing something on the paper. However, Zhang Nan still has a very good set for such disobedient candidates.

"If you don't stop writing, you will be deprived of the qualification to choose a colt." Sure enough, hearing Zhang Nan say this, Lu Dongzan reluctantly put down the brush in his hand, and then wiped the sweat on his head.

And Zhang Nan walked into the middle of the field and looked at them one by one to see if anyone had really written out this question.