"Forget it, little brother, let's go, let Old Man Zhang solve the problem here!" The cousin didn't plan to pay attention to this Zhang Qiuhan anymore, and pulled Ling Huyuan and prepared to leave.

"......" Ling Huyuan did not answer his sister, but instead lay down opposite Old Man Zhang, staring intently at the desktop, as if he had been completely addicted to it.

"Little brother, what are you doing?" As soon as my cousin's words fell, the whole room began to shake, and at this time, when the old man also put down the dagger in his hand, the platform in the center of the room began to slowly descend, and a new door opened, revealing a passage to the next secret room.

"Did he really solve this doctor's math problem?" The cousin grew her mouth, "Impossible...... It's impossible, maybe he just happened to do it...... But how is this possible, how can there be a situation where he has just done this kind of problem, if there really is, then he must also be exposed to advanced mathematics from time to time, is this old man Zhang really a university scholar? ”

"But the game is good, I'm still a university student, and I'm 80 years old...... How is this possible, how can there be such a person in the world...... Wait, it seems that something is wrong......" All kinds of thoughts and thoughts came out of my cousin's heart, and she actually stopped where she was for a while.

"Little one, hurry up, aren't you in a hurry?" Old Man Zhang said gently.

"Yes, Grandpa!" The cousin immediately subconsciously said obediently, looking at Ling Huyuan beside him was a little strange, and his sister seemed to have become a little different.

The three of them quickly entered the second room, and as soon as they saw it, the cousin was stupid again.

Because if the first room is still the same as the room I saw before, then the second room is completely different from the previous room, and the second room obtained by my cousin before is actually the same as the first room, and the same is the answer in the middle.

But at this time, this room is different, there is a river in the middle of this room, dividing the entire room into two halves, which makes the fox sisters and brothers look confused.

"What kind of test is this?" Ling Huyuan asked stupidly, and at this time, his cousin had already walked to the edge of the river, picked up a piece of stationery from the ground, and then read it directly, "There are 200 pieces of 1 meter × 1 meter white paper in the corner of the room, please use these papers to make a bridge, cross both sides of the river, let all players pass normally without collapsing, and the test is declared successful"

"Make bridges out of paper? Isn't that easy? I remember having this in my handwork when I was in elementary school! The cousin breathed a sigh of relief.

"No, it's not that simple, it's indeed possible to build a bridge out of paper, but the length plane that this bridge has to cross is too wide!" Ling Huyuan looked at the river in front of him and couldn't help frowning.

In fact, in the manual homework of the sixth grade of primary school, there is a complete handiwork of making bridges with paper, and the bridge can fully bear the weight of a primary school student.

But it was different in this room, Ling Huyuan touched the feel of the paper provided to him, which was the appearance of ordinary printing paper, and the paper provided in the manual work was hard-shell paper, which was much worse in terms of materials.

Also, the knock in the manual work is actually a flat bridge, which can have many pillars to support the paper. But what is needed here is a paper bridge that actually crosses a river.

Although the river is in the room, it is more than three meters wide, which means that the middle part of the paper bridge will be completely hollow, without any bearing point.

How to build a perfect paper bridge!

"Should you choose a triangular bridge with the most stable triangular pillars in terms of shape, or an arch bridge that can smoothly disperse gravity?" Ling Hu Yuan fell into deep thought, "The triangle is indeed the most stable, but it is not easy to show on the bridge. If it's an arched bridge, you need a lot of paper and a stable enough bracket at both ends, but these 200 pieces of paper are probably not enough! ”

"By the way, what if you use a combination of triangles and arches, or multiple arches, to share the force?"

"No, no...... There is no support at all under the bridge, and multi-arching is absolutely not possible...... Oh my God, there's still the problem of fixing, I remember that we were given duct tape on the manual homework in elementary school, so we could fix the paper together, but there was nothing here, what did we use to fix it!"

"And the length of the paper, which is 1 meter × 1 meter, can't cross a three-meter-wide river, and has to be fixed with tape, but there is no tape here!!"

Ling Hu Yuan's head was a little numb, but he couldn't think of a reason.

"Little one, what's going on in your head, can't you come over to help?" Ling Huyuan, who fell into endless contemplation, felt that his head had been knocked out, and then he saw Zhang Qiuhan's old face.

"Elder Zhang, do you already have an idea? Do you already know how to build a bridge? Ling Hu Yuan said with a surprised expression.

"Hmm!" Zhang Qiuhan nodded.

"So what style of knock did you decide to make? Arch bridge, multi-arch bridge, or triangular bracing bridge? ”

"And your ......"

"Stop!" Zhang Qiuhan pressed Ling Huyuan's mouth, "Don't ask endlessly, work honestly!" ”

After Zhang Qiuhan finished speaking, he handed a pile of white paper to Ling Huyuan and said, "Come like me, roll these white papers into a solid note!" ”

I saw Zhang Qiuhan start to roll up a piece of white paper in his hand along the edge.

Zhang Qiuhan rolled very tightly, almost on paper, and there was no excess air in it.

The last piece of white paper of 1 meter × 1 meter was forced to be rolled into a long paper stick the thickness of an index finger by Zhang Qiuhan.

"How? Do you see? Zhang Qiuhan asked.

"Naturally, I understood it...... But what's the use of this...... "This kind of production process is extremely simple, even a fool can understand it, Ling Hu Yuan naturally has no problem, but he doesn't know what Zhang Qiuhan wants to roll paper for like this."

"Roll one yourself, and then try to fold it!" Zhang Qiuhan said with a smile.

Ling Huyuan obediently rolled one, and then slammed it a little harder...... Because he was afraid that the paper would be broken directly, Ling Hu Yuan didn't use much strength.

As a result, Hu Yuan was surprised to find that this paper stick, which was more than one meter long, was actually very hard, and he couldn't bend it.

Of course, if Ling Hu Yuan exerts a lot of strength, this paper stick will still be able to roll, but Ling Hu Yuan is not stupid, a paper stick may be bent, but when 10 2100 such paper sticks are tied together, even if he is the reincarnation of Popeye, it is impossible to fold the paper roll.

"This is Old Man Zhang's method? It's so smart! A wave of admiration welled up in Ling Huyuan's heart, as if he had seen the scene of crossing the river through a single-plank bridge composed of 200 paper sticks.

At this moment, as soon as Hu Yuan's little hand was released in an excited state, the entire paper stick lost the forcible imprisonment of human power, and the whole person dispersed.

Ling Hu Yuan's little face turned pale in an instant.

"Old man, your plan doesn't work, our paper sticks are stressed, they will fall apart, we don't have glue and tape, we can't fix it at all!!" Ling Hu Yuan shouted.

[PS: Let's think about it, how Mr. Zhang can use these paper sticks to make a stable bridge without any glue tape or any other auxiliary props anyway!] 】