“Yes…yes!”

Murong Yanran suddenly woke up from her sleep.

I thought of an answer.

"No roosters, twenty-five hens, seventy-five chicks, exactly one hundred!"

"Twenty-five hens for seventy-five cents, seventy-five chicks for twenty-five cents, that's exactly one hundred cents!"

"Great, I figured it out!"

Murong Yanran was extremely excited.

Li Yinhuan slowly sat up and looked at Murong Yanran in confusion.

I was sleeping soundly, why are you so dizzy?

What rooster and hen.

It was just dawn.

Murong Yanran rushed out of the house excitedly and knocked on Qin Yuan's door.

Qin Yuan was so sleepy that he couldn't open his eyes. He vaguely glanced at the sky outside.

It's still dark outside.

I must have heard it wrong, so I went back to sleep.

Not long after, Qin Yuan fell asleep again.

“Bang, bang, bang—”

There was another rapid knock on the door.

"Qin Yuan, open the door quickly!" Murong Yanran said in a soft voice.

Murong?

What is she here for?

What happened?

Forced by professional ethics, Qin Yuan resisted the urge to sleep, pulled on his clothes, opened the door, poked his head out, and asked, "Murong, what's wrong?"

Murong Yanran looked at the sleepy, yawning, and listless Qin Yuan and said ecstatically, "Qin Yuan, I figured it out! I figured it out!"

Qin Yuan: “…”

I even want to die.

So early in the morning, you woke me up from my bed just for this?

It's just a problem solved, why are you so excited?

well--

What does it mean to lift a rock and drop it on one's own feet?

You reap what you sow.

Fortunately, I didn’t tell Murong Yanran about famous classics like "Dream of the Red Chamber".

Otherwise, how can I live a peaceful life?

Qin Yuan was filled with helplessness. He rolled his eyes at Murong Yanran at the door and yawned, "Solved? What's the result?"

"No roosters, twenty-five hens, seventy-five chicks, exactly one hundred!" Murong Yanran looked secretly proud.

"What else?" Qin Yuan asked expressionlessly.

"Uh..." Murong Yanran was stunned when she heard that, and asked in surprise: "There's...there's more?"

"Yes, there is more." Qin Yuan replied.

"Then I'll go back and think about it again?" Murong Yanran asked tentatively.

"Go back."

Qin Yuan slammed the door shut and reached out to touch the quilt.

Still warm.

Take a nap now!

With a whoosh, Qin Yuan jumped into the bed again and rolled himself up like a dumpling.

The other side.

Murong Yanran walked, gesturing with her hands, her brain working rapidly, making calculations.

If there is one rooster, one hen, and ninety-eight chicks, that is not right.

One rooster, two hens, and ninety-seven chicks is not right either.

…

Four roosters, eighteen hens, and seventy-eight chicks.

Twenty cents, fifty-four cents, twenty-six cents, exactly one hundred cents.

Wow!

Murong Yanran was cheered up and came up with a new solution!

He immediately stopped, turned around, and ran back with sparks and lightning all the way.

“Bang, bang, bang!”

Qin Yuan had just fallen asleep when he heard a knock on the door. He was suddenly awakened and his blood pressure suddenly rose!

He suddenly opened the door and said fiercely, "Have you figured out the answer again?"

"Yeah." Murong Yanran nodded.

"Are there four roosters this time?" Qin Yuan asked.

"That's right." Murong Yanran was a little proud. It seemed that there would be no problem this time.

Qin Yuan sighed: "It's just pieced together one by one, right? The answer is still incomplete."

"What!" Murong Yanran was shocked. "How did you know?"

"Of course I know!"

"Then I'll go back and calculate it?"

After saying that, he turned and left.

“No, no, no!”

If you keep on torturing me, I'll have a nervous breakdown!

Qin Yuan quickly grabbed Murong Yanran's arm and said, "Let me tell you about my idea. Don't go back and figure it out."

"There are four solutions. How long will it take you to figure this out?"

"Don't worry, I'll make it for you within an hour!"

Murong Yanran already has ideas and methods, and she expressed confidence in her abilities.

Qin Yuan squinted at her and said disdainfully, "Coming up with answers, is that considered an idea?"

"My problem is just about a hundred chickens. If I asked you to count a thousand chickens, or ten thousand chickens, how long would it take you to finish it?"

“Hmm…”

These words were like a club hitting Murong Yanran on the head.

The whole person was depressed.

It seems to be true.

One hundred is easy, but how long will it take to count one thousand or ten thousand?

Qin Yuan yawned as he returned to the house, took out a pen and paper, and explained.

"First, you need to analyze the question and get information from it."

"Obviously, two pieces of information can be obtained."

"First, the total number of chickens is one hundred."

"Second, the total price of the chicken is one hundred coins."

"Yeah." Murong Yanran nodded repeatedly, indicating that there was no problem.

Qin Yuan continued, "Since the question requires us to find the number of roosters, hens, and chicks."

"Then let's assume that there are A roosters, B hens, and C chicks."

"Based on the information given in the question, we can get the following two formulas."

"Then, by performing calculations, we can find the relationship between the number of roosters and hens."

"Now let's assume the new relationship is D, and we can solve the relationship between A and D, the relationship between B and D, and the relationship between C and D."

"Then, when D is zero, we can get the number of A, B, and C."

"By analogy, the value of D will be constrained by A, B, and C, so there will definitely be an upper limit."

"We can calculate it in minutes and come up with several options."

call--

Qin Yuan introduced his ideas in one go.

Murong Yanran on the side was stunned.

Assuming the unknowns are A, B, and C, this operation is not particularly advanced, and similar ideas have been written about in the ancient mathematical classics.

The truly advanced thing was to rely on only two equations, then link the fourth unknown quantity, and infer three unknown numbers. This operation really shocked Murong Yanran.

Moreover, the solution process was too fast. It took less than a blink of an eye. It was hundreds or thousands of times more efficient than her method of scratching her head and still unable to figure out the answer.

Qin Yuan handed the slightly messy piece of white paper to Murong Yanran, and then asked her to leave his room.

Then with a "bang", he slammed the door shut and went back to sleep.

Murong Yanran held the paper, put it away carefully, and prepared to go back and take a closer look.

Is there anything he can't do?

Since he knows so many things, why does he have to pretend to be a pig and eat the tiger and pretend that he knows nothing?

Murong Yanran stood at Qin Yuan's door, silent for a long time.