After returning to the room, Yang Nianzhong invited the old grandmother to sit on the sofa, and then made coffee and tea by himself.

"Did the little monkey run out and buy everything he should have bought in the morning?"

As soon as Yang Nianzhong saw that the old man was interested, he came to the dining room with a smile, took out the toolbox on the table, returned to the living room and opened it, and took out the tools inside, and introduced to the old man what it was for, and put all the tools on the coffee table, Yang Nianzhong said to the old grandmother.

"Grandma, I told you that the cross your father left you is not only the key to open the safe, but even the code of the safe is hidden in this cross."

"But this cross, the key to open the safe, and the only relic your father left you, can't be damaged in any way."

"So I'm going to use these tools to prove whether my guess is accurate, and only by confirming whether my guess is correct can I boldly study this cross thoroughly and help you get back your father's legacy."

As soon as the old man heard Yang Nianzhong say this, he didn't say a word, so he took out the cross around his neck, handed it to Yang Nianzhong's hand, and patted the back of Yang Nianzhong's hand and said.

"Son, don't worry about it, you are right, this cross is indeed the last relic left to me by my father, and I originally wanted to take him to the coffin."

"But since you have such a guess, then you will take this cross until you understand it, and what money is it at my age? What is a commemorative object that does not mean much to me other than a precious memory. ”

"My only wish is to get my father's stuff back from the bank in my lifetime, not because of the money my father left behind to fight the bank, you know?"

Can Yang Nianzhong not understand? The old man is over 90 years old this year, how much time can he live? If the old man competes with Henry Bank at the age of 60, it may be because of the inheritance.

But when he is in his 90s and is about to reach the age of 100, he will drink Henry Bank again, not because of the money from the inheritance, but because he wants to get justice. In order to get this justice, in order to fulfill his dream, the old man can give up anything, including this cross.

The more the old man said this, the more Yang Nianzhong felt that he should be cautious, or please excuse me for the old man's trust in him, so Yang Nianzhong nodded solemnly

First remove the chain of the cross, and then put the cross on it, and the weight of the Porsche electronic scale soon came out, a total of 86 grams.

At this time, Yang Nianzhong confirmed his judgment even more, and saw the old man staring at the electronic scale curiously, and said with a slight smile. "Grandma, do you see the weight on the scale? This cross is 86 grams. ”

The old grandmother nodded with a smile, staring at Yang Jianzhong like a curious elementary school student, innocently looking at Yang Jianzhong and asking. "I can see the weight of the child clearly, is there anything wrong with this weight?"

Yang Nianzhong nodded with a slight smile, took this cross in the palm of his hand and looked at the old man and said. "I haven't made the right judgment yet, but you have to keep this weight in mind, and I'm going to take measurements next,"

After saying that, he took out the caliper he bought, and then began to measure the accurate data of this cross, such as how long and how wide it is? And all the data is documented.

At this time, the old man's eyes were getting brighter and brighter, and when Yang Nianzhong recorded the last data in the notebook, the old man took the notebook and pencil in his hand, looked at Yang Jianzhong's big eyes and didn't understand, and said with a smile.

"I know what you're doing, but you want to play dumb riddles, so I'll play this game with our grandparents."

As soon as he saw that the old man was interested, Yang Nianzhong made a gesture of please, and the old man triumphantly took a pencil and began to do some calculations in the notebook, and soon calculated the volume of this cross.

After getting this accurate data, Yang Nianzhong took a sip of the teacup, and the old man who was still frowning and cracking the answer said with a slight smile.

"Grandma, you have been a people's teacher all your life, although you only teach English, but you should still understand some basic knowledge, do you see the difference?"

As soon as the old grandmother saw Yang Nianzhong's stinky fart, she snorted dissatisfiedly, tilted her head and put her chin on her hand and thought, thought, thought, and thought for more than half an hour, but she didn't think of what was the key, and finally the old man had to admit that his head was rigid.

Seeing that the old man had taken it and admitting that he had not found the answer, Yang Nianzhong smiled, lit a cigar and put it in his mouth while smoking and explained to the old man.

"Looks like I'm still smart,"

"I said that you kid can not be so complacent It's really annoying, I'm admitting defeat, don't be complacent, you kid, maybe your guess is not correct, if you have any ideas, say it quickly."

When he saw the old grandmother, he didn't find out what was in it and was not convinced, which made Yang Nianzhong feel particularly funny, and looked at the old man proudly. "Okay, okay, I'll tell you right now, after my calculations, it turns out that there must be no nearest place in this sterling silver cross of yours."

The old lady nodded with a frown, and asked innocently. "Really? So little monkey, tell me, what's wrong with this cross? ”

Yang Nianzhong said with a smile. "Do you think, I weighed this cross with an electronic scale, and I also asked you to record this number in your heart, how much does it weigh?"

The old man didn't think about it, and said as soon as he opened his mouth. "That's right, you made me write it down, it weighs 86 grams."

Yang Nianzhong nodded and said. "If I didn't make a mistake, the area of this cross should be 10 cubic centimeters, and 10 cubic centimeters should be 105 grams based on the density and weight of silver."

"Then the question arises, the weight of the cross should be around 105 grams, so why is it only 86 grams? Where does the weight of these dozen grams go without that? ”

Ouch, when the old man heard Yang Nianzhong explain this, his eyes were like two light bulbs flashing with golden light, and he muttered while nodding.

"You're a little monkey, you're really smart, right, where did you run away with a dozen grams of weight less? Simple question, why haven't I found the answer in my life? ”

Yang Nianzhong sighed, grabbed the old man's hand and said. "That's because you care so much about this cross, it's not just the key to the safe, it's the only relic your father left you. You can't bear to hurt this cross, so you turn your attention elsewhere and ignore it. ”

When the old man heard Yang Nianzhong say this, he couldn't help but shake his head and smile bitterly, and said with emotion. "You're right, I've been carrying this cross all my life and haven't figured out what it's about, because it's so precious to me."