The Extraordinary Apothecary at Hogwarts

"Chickens and rabbits are in the same cage. There are 100 chickens and rabbits in total. The chicken has 28 fewer feet than the rabbits. Calculate the number of chickens and rabbits."

Sissy hasn't recalled elementary school mathematics for a long time, and it was this kind that impressed me the most at that time.

Just because it's fun.

Assuming that it is all rabbits, the first thing to find is chicken, and vice versa, I like it maybe because the rebellious psychology that was about to move at that time was satisfied.

"It's interesting, but it doesn't conform to the normal logic. So many feet have been counted, can't you choose to count the heads directly?"

That's not the point!

Sissy's words got stuck in her throat for a while and she finally said: "It's just a proposition, the question can be changed."

"Okay, what did you just say that the cows eat grass?"

"It's just a name. It doesn't have to be a cow grazing. It can be replaced by filling a pool."

"In the simplest case, it takes 2 hours to fill a pool and 3 hours to empty it, and how long does it take to fill the pool with water and drain."

Snape raised his eyebrows after hearing this, "You want to fill the pool, right? It's a very stupid way to fill water while letting it leak, isn't it? I believe Muggles would not want to do such a thing. "

Sissy: ...

She had thought this way before, and the person who made the question might not be a fool.

But the primary school Olympiad is just like this, what can she do!

Let's not argue, and focus on the problem-solving ideas.

"You're right that the oversimplified model doesn't make sense.

But practical problems are usually too complicated. If they ask for the additional pressure inside a spherical soap bubble, or calculate the soap bubble will burst after a few seconds, they can't figure out such basic things. "

Yes, they couldn't ask for it, Snape nodded slightly.

At the same time, there is a doubt here.

It's normal if you can't ask for it. On the other hand, Qianqian, who uses two decimal places to calculate the ratio all day long, is justified.

When did you learn it?

Thinking about it, Hogwarts didn't teach it, and it was impossible to learn it so deeply before coming to school.

Not to mention that she lay unconscious for over a year before waking up at the age of 11. How could there be enough time?

It would be too hasty to explain the current situation with hard work and talent.

But anyway...

"Professor, what's wrong with you?" Sissy opened her five fingers and shook them up and down in front of Snape's eyes.

Okay, why are you ignoring people all of a sudden!

"Oh—oh, nothing, go on."

Sissy's mind is now full of various topics, from elementary school to university.

"Cows can eat grass in different ways to increase the difficulty. The grass is also growing at a constant speed. A few cows can eat it in a few days, but we can sell a few cows in the middle, or add the condition of sheep, or even Simultaneously on two grass fields of different sizes..."

Hermione: Stop, stop, that's really enough, don't go any further.

"Are these basic questions?"

Sissy nodded resolutely and said, "That's right, it is taught in elementary school that the problem of cattle eating grass is also called Newton's problem. It was named after a British scientist proposed it in "General Arithmetic" two or three hundred years ago."

The topic created by your own country has spread far and wide, and has harmed tens of millions of students!

Anyway, it is something that everyone will learn.

As the culprit in the UK, the native children can't solve it, can't they?

Then Newton's coffin will not be able to hold it down, and he has to climb out to teach himself.

Snape took Miss Granger's situation into consideration. The little girl whose style of painting has gradually deviated since following the hated Potter, is indeed a bit clever, and she stands out among the Gryffindors.

It should be okay to replace her, uh, it should be fine.

So happy to decide.

"While we're walking the birds, I'll ask Hagrid for two salamander tails. I heard he's keeping them well, so there should be some that meet the requirements."

"Then I'll go now, and take Libo to Hagrid's for a meal." Sissy turned around and threw her hair flying.

Such a good errand is who I am.

As soon as she closed and opened her eyes, she saw her trotting out the door with a bird on her arm.

Most of the roads outside the castle are covered with snow, with deep and shallow footprints on them. Several people have passed by, and it is clear at a glance whether the shoe size is big or small.

Near the Forbidden Forest, there is no sign of anyone setting foot.

Hagrid held a big broom that was as tall as a person in his hand, and was wrapped up in thick clothes. He moved like a big bear preparing for the winter, brushing the snow in front of the door with some clumsiness, and opened a path for walking around.

"Hagrid!!" Sissy pulled her feet out of the snow, and finally she was able to step onto a place where the snow wasn't too thick after rough cleaning.

Hagrid kept his back to the direction she was coming from, and only turned sideways and turned his head when he heard the sound.

"Be careful! There's..."

Before she finished speaking, Sissy's feet slipped and she fell face up into the snow behind her.

"It's freezing over there." Hagrid decided to finish.

Sissy: Well, I know now.

Libo flew down in time and was now meeting her blindfolded eyes with golden eyes.

"Oh, I really envy you who has wings."

Forget it, the birdman is not very good either. My parents are not some strange combination of species, and they can't give birth to Sissy with wings.

Fortunately, there was snow on it, and the back of my head didn't hurt when I fell down.

A human figure was left on the snow, and the original row of footprints was also covered by her shape.

Just like making a snowman, not taking the usual way, the one that is completely hollowed out, or made out of your own body.

Hagrid put down the broom and helped to pat the snow stuck to Sissy's back. Sissy patted and then coughed, which made him frown.

"It's the coldest time now. My clothes are too thin and I'm going to freeze. My scarf is big—I know it's not very pretty, but it's very clean. If you don't mind it, you can use it as a shawl."

Sissy: I don't have a cold, actually, if you pat lightly, I won't cough anymore...

"Thank you Hagrid," Sissy still took the scarf and put it on herself, "I think your complexion doesn't look well, what happened?"

"No, it's okay. I just drank a few more glasses last night. I didn't expect to wake up and still have a headache. I drank a lot of water this morning. After drinking, I'm still thirsty. I can't eat anything else."

Got it, it's a hangover.

It's a good thing that Hagrid won't get drunk, otherwise few people can hold him down.

But such a big man, how can he withstand the consumption of his body without eating.

Sissy stepped into the wooden house. There was no anti-alcoholic medicine at hand, but it was not difficult to find a way to solve the mild one.

It's just that if you want to get something here, you can't reach it.