System: Best School Development
Chapter 35: The Examination Lasts

The classroom was very quiet, only the sound of a "screeching" pen gliding on the exam paper.

In order to maintain the concentration of the six children who were taking the exam, Mr. Rusli deliberately stopped his speech and invited his four students to study quietly.

Handi noticed the six children who were answering questions on the podium. For a moment, he frowned and touched the tip of his nose, and he seemed to be in trouble; for a moment, his eyebrows shot up and his mouth smiling seemed to find a way to make sense of the current state.

Handi looked at the children in confusion, then laughed sillyly. Children in their teens are so simple and cute. Their emotions, sadness, sorrow, and joy are all expressed directly on their faces, and you can tell at a glance whether they are happy or angry, sad or happy. You don't have to second-guess what they think at all, their thoughts are all instantly expressed on their faces.

And what about adults?

An important sign of maturity is "Whatever is happening remains 'Fake Smile'", which means that a person is calm and looks happy but not necessarily in accordance with his original circumstances. In other words, an adult would not let anyone else see his state and choose to keep everything hidden with his fake smile.

Many people say this is not hypocrisy, but this is called disguise.

Disguise is a way to survive better in the adult world. Pretending to be pleasant to make others happy, pretending to be strong without pain and sadness.

Smart in disguise you will live very tired but if not clever in disguise, you will live very hard.

There is no such thing as "easy" in the world of adults aged 18 and over, but that is not necessarily true. For example: easily fat, easily bald, and easy to die suddenly because more staying up late.

"Teacher!" Word suddenly raised his hand, "Is this question wrong?"

Handi smiled and walked over and took the test paper to look at it carefully, and then returned it to the Word: "There is nothing wrong in the question, please think about it."

This test paper was prepared by Handi in accordance with the principle of "6 + 2 + 2", which is 60% basic simple questions, 20% about height, and 20% about the Olympics.

Handi felt that Firman and five other Junior High students would have no problem with 60% simple basic questions and 20% high-level questions easily get a score of 80 points with little effort, and 20% the Math Olympics are hard.

20% of these Mathematics Olympiad questions were carefully selected by Handi, including simpler elementary school Math Olympiads such as chickens and rabbits in the same cage, water intake and drainage, among others, and the proving questions are a little more difficult, and even the famous "Gauss 5050" ", that is, the questions from 1 to 100. This question is included as the final question of all questions. If such students cannot find a good solution to this question, then they can only start from 1 + 2 , +3, +4 ... Start adding, and increase to 100, but this is a very time consuming thing.

"Consideration, the exam time is 90 minutes, and an hour has passed now." Handi reminded.

Right now, everyone had completed the last 20% of the questions, and all of them frowned. Only Udin was different. According to Handi's observations, he solved the simple and high problem as early as 20 minutes ago, and entered the final stage of the Olympics early.

"The last question is a very, very difficult question. It is very difficult and can result in low grades. It was tailor-made by the teacher to test your mathematical thinking. If you feel the time is too limited, you can choose the easier questions and think about them."

Handi was afraid that questions that were too difficult would make the student doubt his cleverness, so he was very persuasive.

"Teacher!" The Word raised his hand again.

"what's going on?"

Word stands up and lifts the test paper and reads: "A swimming pool has suction pipes and discharge pipes. It takes 4 hours to fill the water, and 5 hours to fill it. Turn on the suction pipe first. When a full pool is a quarter of the time, open the inlet and outlet pipes at the same time, and ask how long does it take to create a full two-thirds pool? "

"What's wrong?"Ask Handi.

"The swimming pool is great. Why fill the water while putting it in. He's weird, isn't he?" Firman scratched his head and said, "It's a waste of water, teacher."

In the past, Handi also felt that the brains of the people who caused this kind of problem were toxic and completely incompatible with the reality of life. It wasn't until Handi had a cell phone, and when she played it while charging, she realized that everyone was actually doing something like "water out of water".

It is much wiser to compare the problem of "flow in and out of water" with the problem of "charging electricity". For example, you have 23% battery power left in your phone, which is only enough for two and a half hours, so you decide to charge the phone while playing it, he said, the charging speed is 15% per hour, assuming the speed of power consumption and charging speed are at the same speed during the whole process, how long does it take you to fully charge the battery while playing it?

You see this problem much more realistically.

"There's still 15 minutes before the exam ends." Handi looked at his watch and reminded him.

"Teacher, I'm done."

At this moment, Udin got up from his chair and handed the exam paper to Handi.

The other five children all looked at Udin with incredible expressions.

"Let me see, let me see if he has some questions yet to be filled in" said the Word while investigating.

"Focus on your own paper, Udin has really finished it, and it's full of answers."

Speaking, Handi showed the exam paper a little.

"Huh, that must be absurd." The Word murmured unsure.

Handi glanced at the exam paper in general, and was shocked. Not to mention right or wrong, this Udin really did work on all the questions. Handi hastily turned to the last question, which was a question made by the famous mathematician Gauss, who widely circulated, in elementary school from 1 to 100.

And now the answer to Udin's test paper answers him: 5050.

Here is the answer to this question.

Handi could not help but ask excitedly: "How did you get the answer to this question in such a short time?"

At this moment, Nurul at the side also did this, but he used the longest method, starting at 1 and increasing to 100 one by one.

Udin actually got the answer to this question quickly and correctly, Isn't that contemporary Gauss!

What a great future!

"Nr ..." Udin scratched his head, then said honestly: "Teacher, I actually saw this question in the textbook my father bought me, and then I looked exactly the same, and then wrote the answer...."

Handi also scratched his head speechlessly, okay, for no reason.

"Then, do you know the method of this question?" Sandy asked again.

Udin nodded: "Alright, I know that from 1 to 100 can be seen as 0 to 100, so 0 + 100 \= 100, 1 + 99 \= 100, according to this rule, 0, that is 100 divided by 2 a total of 50 Add 100 and there is an intermediate number of 50. So, this is 50X100 + 50, which is equal to 5050. "

"Alright, as long as you learn the method, it's fine" Handi said excitedly.