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

Overall, in this village, except for the old scholar's mansion, there is only the house of the Lizheng family. The other family is poorer than the other family.

An old woman was sitting in the dusty yard, holding a cigarette gun, smoking dirt cigarettes.

The smell of smoke is very choking, and it is probably the coarseest tobacco leaves.

Seeing the gaze outside the door, the old woman lazily raised her eyelids, glanced casually, and then continued to smoke a gun, ignoring them.

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

Whether it is the old scholar, Li Zheng or Ma, they are all elderly people over 60 years old.

Even if I saw Li Zheng’s son and daughter-in-law in the mourning hall before, I looked in my early forties. Even younger ones were children, but they were not young people in their teens or twenties.

"This place is poor and poor, how can young people stay here?" The old woman in the yard suddenly spoke, "All those who can walk away have left, and those who stay are the only elderly people who can't walk and old bachelors who can't marry their wives."

Several people were stunned, but they didn't expect that this NPC would give information so easily.

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

When the old woman heard this, she laughed silently, and the folds on her face were like deep ravines, giving people an extremely uncomfortable feeling.

At this time, there were bursts of coughing sounds in the room, and then they heard an old man say:

"I've been sick for a long time. When will my daughters come back to see me?"

The old woman held a cigarette gun and kowtowed gently on the ground, saying 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 of them come to see me together?"

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

He replied with his words, but his eyes looked at Du Lai, as well as Fu Miaoxue, Shen Mo and Bai Youwei behind him.

Everyone understood that this was NPC setting questions for them.

Bai Youwei felt relieved.

Fortunately, this question is not difficult.

She asked the old lady: "When was the last time my three daughters reunited?"

"I reunited once 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 sneered and said, "The old woman is old and can't remember it..."

Bai Youwei frowned slightly.

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

"What's wrong with you?" Fu Miaoxue was puzzled, so, "Is this question difficult?"

"The question is not difficult, but there is something missing." Bai Youwei explained, "This is the question in the ancient "Sunzi Jingjing". It asks that the family has three daughters who are married. The eldest daughter returns to her parents' home once every five days, the second 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 left the same day from her parents' home, how many days will the three meet again??"

"How many days?" Fu Miaoxue blurted out.

Bai Youwei: "Sixty days."

The number of days is the smallest common multiple of the number of days between the three daughters.

That is, multiplying the three numbers 3, 4, and 5 will result in 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 prerequisites. We don't know when the three daughters left together."

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

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

Fu Miaoxue said: "Oh, so why bother to do it~"
Chapter completed!