Chapter 527 Sun Tzu Calculation

There is a family next door to the Li family, which also has a mud house and a mud courtyard, and is very poor.

Generally speaking, apart from the old scholar's mansion, only the Li Zheng family's house can be seen. The other families are each poorer than the last.

An old woman was sitting in the dusty yard, holding a pipe and smoking local cigarettes.

The smell of the smoke was very strong, and it was probably the coarsest tobacco leaves.

Aware of the scrutinizing eyes outside the door, the old woman lazily raised her eyelids, glanced at them casually, and then continued to smoke and ignore them.

"It seems that most of the people in the village are old people." Bai Youwei whispered to Shen Mo.

Whether they are old scholars, Li Zheng, or Ma, they are all over sixty years old.

Even Li Zheng's son and daughter-in-law, who I saw in the mourning hall before, looked like they were in their early forties. The younger ones were children, but there were no teenagers or young people in their twenties.

"This place is remote and poor. How can young people stay here?" the old woman in the yard suddenly said, "Everyone who can walk has left. The only ones left are the old people who can't walk and the old bachelors who can't get a wife." .”

Several people were stunned for a moment, not expecting this NPC to give out information so neatly.

Du Lai walked into the yard and asked politely: "Do you know Mr. Li next door?"

The old woman listened and smiled silently. The wrinkles on her face were like deep ravines, giving people an extremely uncomfortable feeling.

At this time, there were coughs in the room, and then they heard an old man say:

"I have been ill for a long time. When will my daughters come back to see me?"

The old woman took the pipe and knocked it gently on the ground, and said to the old man in the room: "Didn't the eldest daughter just come to see you yesterday?"

"Why don't you see the three sisters coming to see me together?"

The old woman sneered and said, "That's not easy. The eldest daughter comes home every five days, the second daughter comes home every four days, and the youngest daughter comes home every three days. Who knows when they can come back to see you together."

He was replying, but his eyes were looking at Du Lai, and Fu Miaoxue, Shen Mo, and Bai Youwei behind him.

Everyone then understood that the NPC was giving them questions.

Bai Youwei breathed a sigh of relief.

Fortunately, this question is not difficult.

She asked the old woman: "When was the last time the three daughters got together?"

"We had a reunion during the Mid-Autumn Festival." the old woman replied.

"How many days have passed since the Mid-Autumn Festival?" Bai Youwei asked again.

The old woman smiled coldly: "I am old and can't remember..."

Bai Youwei frowned slightly.

Not only her, but Shen Mo and Du Lai also frowned.

"What's wrong with you?" Fu Miaoxue didn't understand, "Is this question difficult?"

"The question is not difficult, but there is something missing." Bai Youwei explained, "This is a question in the ancient "Sun Zi Suan Jing". It asks about a family with three daughters who are all married. The eldest daughter returns to her parents' home every five days, and the second daughter The younger daughter returns to her parents’ home once every four days, and the younger daughter returns to her parents’ home once every three days. After the three daughters leave their parents’ home on the same day, how many days will it take for the three of them to meet again??”

"How many days?" Fu Miaoxue blurted out.

Bai Youwei: "Sixty days."

The number of days is the least common multiple of the number of days between the three daughters returning home.

That is, the three numbers 3, 4, and 5 are multiplied together to get 60.

Fu Miaoxue blinked and said, "Then tell her the answer."

Du Lai held her hand and pulled it behind him, "What is missing is the prerequisite. We don't know on what day the three daughters left together."

"There should be clues about the Mid-Autumn Festival nearby." Shen Mo said, "Let's search separately."

As long as you figure out when the Mid-Autumn Festival is in this game, you can calculate the next time the three daughters will come back together.

Fu Miaoxue said: "Oh, what are you doing to trouble~"

After saying that, he jumped up to the old woman and said, "Hey, your three daughters will be back tomorrow~"