Xia Xiaodong carefully read the topic twice, flipped the paper over again, and looked at it, blank.

This is the problem that has stumped countless people in Xia Danfeng's mouth and has not been solved so far?

If this is the case, then it is really necessary to re-evaluate the contemporary level of arithmetic.

Grandma Chen immediately saw Xia Xiaodong's strange performance.

Shouldn't it be at a loss, pondering, or scratching your ears and cheeks?

Xia Xiaodong met Grandma Chen's eyes, blinked, and asked weakly: "This...... Isn't it enough to weigh it once? ”

Once? Once?!

Grandma Chen raised her leg and walked towards Xia Xiaodong, almost tripped herself with her left foot and her right foot. In just a few steps, she has regretted it countless times, she shouldn't have let Xia Danfeng go - at least she should have let her say the answer before leaving, didn't she say that she knew the answer, but she didn't know the algorithm.

"Why did the girl say that she only needs to weigh it once?" Grandma Chen didn't believe the answer of 'once' in her heart, but she still asked patiently as much as possible.

"Well, Grandma Chen, please take a look." Xia Xiaodong only picked up the pen at this time and began to draw circles on the prepared white paper.

The large circle indicates consistency and consistency, and the small circle represents a copper coin. He even drew a simple pattern of a skuji.

"Well, this is the twelve, let's put them in order first." Xia Xiaodong nodded at the big circles: "Then, weigh these copper coins, which are small circles, carefully weigh them clearly......

Of course, it still has to go through a number of analysis calculations and so on, but fortunately, Xia Xiaodong has pulled down the contemporary arithmetic level by several grades, and has also re-evaluated the arithmetic level of Grandma Chen herself, so she tried to explain it as simple as possible, and only after saying that there was enough tea time before it was finished.

"In that case, wouldn't it be enough to weigh it once?" Xia Xiaodong raised one eyebrow and looked at Grandma Chen.

Grandma Chen didn't speak for a long time.

She couldn't fault it.

However, it occurred to her that if the answer was to be made public, it would ...... This question is useless.

It means that it is useless, and it has no value for reuse.

Such an interesting topic, it can be used again. After all, good topics don't come often, and Xia Xiaodong doesn't often have them. This topic can be changed on other occasions and continue to be carried forward, so it's a pity to reveal the background!

She now believes that Xia Danfeng really doesn't know the answer. If she hadn't listened carefully and carefully, she would never have thought of such a way.

But if it is not publicized, then there are so many people outside who are still waiting.

"Miss Xia, can you ...... Come up with another solution? Grandma Chen made a request with some difficulty.

What? Come up with another one? You think it's a hen laying eggs, one left and one right.

"The other solution is not the least number of weighings." Xia Xiaodong said matter-of-factly.

The requirement of the question is to find the least. Once is less, and there is no less. If you have to find another solution, it must be more than once.

"It's okay, it's okay," Grandma Chen hurriedly said: "Two or three times, four or five times." As long as you can explain it yourself. ”

"......" Xia Xiaodong pondered for a while, and roughly guessed Grandma Chen's intentions: "Does Grandma Chen not want to make the true answer public?" ”

Then use me as a cover? Xia Xiaodong suddenly felt a little uncomfortable, and if he had another solution, wouldn't he make himself look ...... than real...... Be stupid?!

Obviously the answer is once, but it has to be announced, and how many times has it been explained?

The smile on Grandma Chen's face was about to be unbearable, and she reluctantly said: "The girl should also see that this topic is indeed exquisite." I just thought that I could let the ladies in the palace look back at the New Year's festival and be a guessing puzzle or something to relieve boredom. ”

It's quite light, but Xia Xiaodong still understands.

"Okay then." Xia Xiaodong agreed: "Then since you have provided two solutions, should you give me forty bamboo sticks?" ”

Grandma Chen: "......" actually remembers the bamboo sticks, and there are forty more! But yes, the bounty is twenty, and now if you want someone to solve it twice, don't you have to give forty?

However, Grandma Chen couldn't increase the number of bamboo sticks by herself, she thought about it and paid a price: "How about thirty?" I went to tell Xia Danfeng and asked her to take ten more of the bamboo sticks collected in addition to the reward. ”

Thirty is thirty. It's not fun to ask for too much.

Xia Xiaodong nodded in agreement: "Then it's good to weigh it three times." There are many ways to call this. ”

"For example, for the first time six or six folios, there is fake money on the light side. Then there will be six of the fake money, and then three or three of them, and the same light side will have fake money; Then there will be three fake money, one by one symmetrical, the light one is fake, if the same heavy, the remaining one is fake. ”

"You can also open five or five for the first time, four or four, three or three, anyway, if you weigh it three times, you can open it any way."

What Xia Xiaodong really didn't understand was that if three times was an acceptable answer, no one would be able to answer it right before?

Grandma Chen listened to Xia Xiaodong like flowing water, counting several names, and it was obvious that she could continue to count down, until her mouth opened wider and wider, and she really didn't understand, why would an official lady understand this?

You know, most of the young ladies, you talk to her about silver and copper coins, she can't tell how to convert, just what a copper coin weighs ten coins means, it takes a long time to understand, as for what is a thing, how to use, there are very few people who know.

"Wait," Grandma Chen suddenly thought of something: "The girl said six or six folios, five or five folios and the like, which seems to be different from the common usage of the son." ”

"Yes," Xia Xiaodong glanced at her, "The method of weighing only once, the one is commonly used." When you weigh it three times, you can only use it on the scale. ”

"Scales?"

"It's the middle prop, specifically weighing whether the two ends are the same heavy thing." Xia Xiaodong explained: "It's good to borrow the crossbar of the pole, maybe everyone will think that this is the key to solving the problem." ”

Grandma Chen's eyes lit up: "Girl, this idea is really good!" ”

"How to get it, grandma can play on her own. I'll go back first. Xia Xiaodong unceremoniously picked up the two packages left by Xia Danfeng - this is an addition, take it first, and then look back at Grandma Chen.

Grandma Chen smiled wryly, and quickly took out thirty bamboo sticks and directly helped Xia Xiaodong stuff them into the package.

Xia Xiaodong happily walked away with his things, and waved his hand at the people outside the door, indicating that everything was fine.

"Wow! Sister Xiaodong! Miss Qin Si was overjoyed: "I knew you could do it!" ”

(To be continued.) )