The maid squad is too strong, what use is there for me, the Demon King?

"The first digit and the last digit are both correct, this is the correct answer!"

Lia's eyes lit up.

So my older brother is a math genius?

"Please teach me, Mr. Gray!"

Gray was quite pleased, after all, it was his own sister's admiration, and who wouldn't want to show off in front of their cute little sister?

At 14, I feel I can teach you how to solve equations with unknowns, so I won't teach you any of those messy, complicated methods like the "lifting foot" method or the "chicken and rabbit in the same cage" problem.

Give Liya a shock with a system of two linear equations...

Gray really wanted to use his knowledge from his past life, otherwise his previous life would have been wasted.

I didn't intend to be too flashy, but Gray seems to have gone a bit too far...

Gray helped Leah check her math homework, which took half an hour, before leaving Leah's room.

But he was still careless; he never expected Leah to pull such a stunt on him...

On the same day that he finished teaching Leah, Grey was summoned by Ed Brandt again.

"I heard from Liya that you're good at math? She came to me asking if you could be her math tutor during the holidays."

Ed Brandt's bluntness made Gray's lips twitch.

Lia! Why did you tell Father?!

It's not entirely incomprehensible; if Gray were to teach Leah math, he would need to go to Leah's room every day for one-on-one instruction.

It would be good for him to inform his adoptive father, Ed Brandt, beforehand that he was constantly going to his sister's room, since they were not blood-related siblings, to avoid unnecessary suspicion.

But Leah boasted about her mathematical skills to Ed Brandt...

"My brother is a genius! He might even be better than the math teachers at the academy!"

Intrigued by Leah's exaggerated description, Ed Brandt immediately commissioned someone to create a math test.

"Finish this set of papers within one hour..."

Ed handed the parchment exam paper to Gray.

Gray took the test paper and glanced at it.

This is child's play; any junior high school student could solve it in half an hour.

But Gray wasn't sure what level of math this problem would be considered in the context of the world's mathematical standards.

Do you need to turn on the water?

Gray quickly dismissed the idea.

I already promised Liya I'd teach her, so I can't let her fail my adoptive father. If he orders me to stop teaching her, Liya will probably cause him a scene again.

“Sigh…” Gray sighed softly.

Let's just write normally...

Half a cup of tea had passed, and Ed hadn't even finished his tea when he received Gray's exam paper.

Gray looked utterly helpless.

Good heavens, after two lifetimes, I'm in another world, and the damn exam papers are still chasing me!

Ed Brandt, as the head of a noble family, had also received a mathematics education and knew the level of this test paper.

If you let him do it, there's absolutely no way he could finish it in half an hour, and the accuracy is even more unreliable.

But the tea was still warm when Gray had already handed in his paper.

He hurriedly asked someone to grade the papers, and was somewhat stunned when he saw the pile of checkmarks on the papers.

"100% accuracy..." Ed couldn't help but look at Gray with newfound respect.

I never expected this kid to have such talent...

But that's just a superficial appreciation. In the eyes of people in the magical and fantasy world, mathematics is merely a side path, its greatest use being to assist certain magical disciplines.

In Ed's eyes, no matter how good one's math skills are, they can't compare to a low-level magic.

But he still asked with great interest, "I don't remember being taught math in such depth. You learned everything on your own after that?"

Gray promptly shifted the blame to Iota: "It was Cyrus who taught her; she studies these things all the time..."

The situation is actually quite the opposite, though Gray admits that Iota is much stronger than him now.

Fortunately, Ed did not suspect anything.

He had heard his old friend Cellas boast about how incredibly smart his daughter was.

I initially thought it was just a publicity stunt to promote my daughter, but it turns out she has real talent.

Ed didn't care about this at all; in fact, he was quite pleased.

Anyway, she's our future daughter-in-law, and being smart and capable is much better than marrying in a pretty but useless woman.

“Okay.” Ed Brandt nodded in approval: “During the Astraea Magic Academy holidays, you will teach Leah math for one hour each day.”

Lia's performance at Astraea Magic Academy was above average, but not outstanding, and far from Ed's expectations.

Due to their family's financial difficulties, the Brant family could no longer afford better teachers or more resources in the field of magic.

Even unorthodox subjects like mathematics are counted towards grades at Astraea Magic Academy, and given that Lia seemed quite enthusiastic about it, he had no reason to object.

Having gotten past his adoptive father, Gray breathed a sigh of relief.

He must have agreed...

But Liya still has almost a month left on her vacation, and agreeing to this means he will have to stay at the Brant residence for the entire month, since he will be teaching Liya math every day.

Being able to relax at home for a month is certainly a good thing, but Gray has an imminent crisis. Is it really okay to continue to relax like this?

However, Gray understood the principle that haste makes waste, and he knew that rushing things would only make things worse.

I'll spend this month traveling around Bifeng Territory to calm my mind...

The time for Grey to teach Lydia was set for the morning.

One hour after getting up and having breakfast in the morning.

A strange sense of drowsiness...

Hmm? In the morning, after breakfast...

Isn't this 8 AM?

Gray then realized that after spending so much time in this other world, his concept of time had been basically assimilated by this world, unlike his previous life in modern times where a day was divided into 24 hours and calculated so precisely.

The time system here is closer to that of the ancient Xia Dynasty, which divided the day into 12 two-hour periods, but did not use methods such as Zi, Chou, Yin, etc. to name each two-hour period.

The time system in this world has a combination of ancient Chinese and Western elements.

Aside from the morning, noon, and evening banquets, and the hour he spent teaching Leah, Gray was free to move about in the Azure Peak Territory. After all, Ed Brant was still handling the affairs of the Brant family and the territory as the head of the family, and Gray had nothing to do with it.

Gray spent his free time traveling around Bifeng Territory and visiting Aiotah.

Thanks to the activities of the Shadow Court, there are no thieves to be seen in Bifeng Territory now. Occasionally, slave traders and cultists will be dealt with by the servants stationed in Bifeng Territory.

It is said that Bifeng Territory is no longer what it used to be, but only the security has been restored to the level of a normal territory. The living standards of the people have been restored from the poorest of the poor to the poorest of the poor. It will take some time before they can be restored to the level of ordinary people.

As the living standards of the people improve, taxes will also rise, which will help the Brant family's revival, but not by much.

The fundamental problem with the Brant family was that they lacked prestige among the nobility; most nobles were unaware that such a family existed in the Kingdom of Olmec.

The Brant family's road to recovery is long and arduous.