Xiao Zhengjun took a deep breath. "Stop, stop, stop counting on your fingers. Come on, look at this question."
The question is: There are chickens and rabbits in a cage. There are a total of 35 heads and 94 feet. How many chickens and rabbits are there?
"This is called the chicken and rabbit problem. In the future, when you encounter this kind of problem, don't just think about counting on your fingers; you have to learn to use your brain."
The little one protested: "I moved!"
Xiao Zhengjun hummed in agreement twice. That's not important. What's important is...
"Dad will teach you a really simple method today, and I guarantee you'll learn it in no time."
The second child: "Really?" He didn't believe it.
"That's definitely true."
Xiao Zhengjun said, "Let's take an example. Suppose, I mean suppose, all the rabbits here are standing up..."
Before he could finish speaking, his second son interrupted him, "Dad, rabbits can't stand up. Xiao Hong's family has one, and it lies on the ground all day eating carrots."
"Never mind whether it can stand or not, I'm just using an analogy! Look, they're all standing up now, so does that mean the rabbit only has two legs on the ground?"
The second child imagined it for a moment.
Seeing that he remained silent for a while, Xiao Zhengjun gave him an encouraging look, "Have you thought of something?"
The little one pursed his lips, his face full of question marks, "Dad, aren't they tired of standing? Won't they fall over?"
Xiao Zhengjun: "..."
Xiao Zhengjun didn't know if the rabbit would fall over, but he was really about to collapse with anger.
He gritted his teeth. "Not tired... How could it be tired? We're just using an analogy!"
"And from now on, they will stand up. Don't ask why we won't put them down!"
"Because Daddy won't let them go, understand?"
"Oh." The second child understood.
"Okay, now all the animals are standing on two legs. Didn't we just say there are 35 heads here? And each head has two legs, so how many legs are there in total?"
"70!"
"Yes, there are 70 in total. So there were originally 94 legs. How many legs are missing now?"
"24 are missing."
Xiao Zhengjun felt victory was within reach. "Think again," he said, "whose 24 missing legs are they?"
The younger child said, "Oh, Dad, I understand!"
However, while writing, I was still muttering to myself, "With so many feet in the cage, won't they step on them?"
And chickens will peck at them!
Who came up with this question? They have absolutely no common sense.
After rambling on for a while, he turned to his brother and asked, "Brother, do you think what I said is right?"
The eldest brother covered his ears with one hand, indicating that he couldn't hear anything. I couldn't hear anything either.
A moment later, the younger one said, "Dad, I'm done writing!"
"Yes, that's great."
Xiao Zhengjun glanced at the time. "I'm going to wash your sister's diapers. You hurry up and finish your essay. Keep an eye on the time and stop whining."
"Okay, I understand."
After Xiao Zhengjun left, the younger brother quietly pulled down his pants and took a peek.
The eldest brother asked curiously, "What are you doing?"
"It's not crooked at all."
After confirming, the younger brother went to pull down his older brother's pants, asking, "Brother, is yours crooked?"
Upon hearing this, the young leader's face darkened, "..."
Could someone kindly take him away? We can't keep this little brother!
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