It can be seen that the sum of the so-called "residuals" is meaningless and logically wrong. In this case, it is meaningless whether the number is more than or less than the total amount of money spent.
You may feel a little mysterious when you say this. Well, let's put it another way. What is "surplus"? Is the 50 yuan in that hand "surplus"? The interview questions were deliberately not included, and I played a trick of "stealing the column". That is to say, the first item in the column of "surplus" should be 50 yuan, and then the "surplus" 30 yuan after the first shopping. Starting with "surplus", the number of "surplus" in front actually includes the number of "surplus" behind, and so on, isn't it? How do such figures accumulate?
It can be seen that if the remainder can be accumulated (or meaningful), then the accumulation of the remainder must be that the more times, the larger the number. In other words, the remaining total amount must be greater than or equal to the total amount of money spent on shopping. The interview questions are deliberately "fudged"!
Might as well use mathematics to prove:
The first time you spend one yuan, there is only 50-a left.
The second time you spend B yuan, you get (50-a)-B.
Suppose we spend C yuan for the third time, then we have (50-a-b)-C.
Suppose the fourth time spent D yuan, then (50-a-b-c)-D remains.
Then the total cost is: a+b+c+d=50 yuan's last surplus: 50-A-B-C-D = 0 yuan.
Because the original money in hand MINUS the money spent is equal to the last remaining money, which is 0, it can be seen that adding the remaining amount every time has no practical significance.
Or: the sum of the remaining money is:150-3a-2b-c.
Because a, b and c are uncertain numbers, the sum of the remaining money has many results. It means that the sum of the remaining money is related to the amount of money spent each time, but it is not equal to the original amount of money.
I don't know what Ma Yun's answer is, and I don't know what kind of answer he wants to hear, but I believe he wants to see if a person can jump out of "fooling" and think and infer correctly without being bound by fixed thinking.
In our work and life, we are often bound by fixed thinking patterns, and we are used to seeing problems from one angle and thinking from another, which is caused by the habit and inertia of thinking. People are easily misled by fixed thinking and "fooled". Mentality is like a pair of colored glasses. Wear it, the whole world is the same color as glasses. Break the shackles of fixed thinking and expand the perspective of thinking, so as to get unexpected results when dealing with problems.
When thinking and solving problems, sometimes we might as well increase the perspective of thinking, observe the same problem from another angle or an additional angle, or reconsider it in a different way of thinking, which often leads to new ideas, new discoveries and new situations.
Just as we are always used to cutting apples vertically, a child cuts them horizontally instead of vertically. As a result, he found that "there is a little star hidden in the apple". Looking at the problem from another angle, we may see a completely different scene, which is the inspiration brought to us by The Stars in the Apple.
There is a "Toyo Rayon Company" in Japan, and they encounter a difficult problem in production, that is, the thickness of five threads of each synthetic yarn is always uneven. No matter how hard technicians try, they can't solve this problem. A large number of defective products directly affect the company's benefits. At this time, a production monitor suggested. Since it is impossible to solve the problem of uneven spinning of five threads, why not directly produce a fabric with rough surface? As a result, this new fabric with rough surface and soft texture is very popular after it is put on the market.
Defective products are usually sold at reduced prices, but that Japanese company changed its mind and turned them into best sellers.