Three-person hotel Problems

1. Three people went to the hotel and stayed in three rooms. Each room was $10, so they paid the boss $30,
The next day, the boss thought that the three rooms only needed $25 yuan, so he asked the younger brother to return $5 to the three guests,
Who knows the younger brother is greedy, only returns $1 for each user, and secretly takes $2, which means nine yuan for each of the three guests,
So the three spent a total of $27, plus the younger brother swallowed up not $2, a total of $29. But the three of them paid $30 in total.
What about $1?

 

 

In fact, catch a main line,
Customer spending = the boss's income + the younger brother's income

The customer started to spend 30 yuan, and then the boss returned 5 yuan, so the expenditure is equal to 25 yuan

Let's look at it again. The younger brother's income is 2 yuan, and the boss's income is 25 yuan. The guest's income is actually 3 yuan (income ).

Next, let's see what 27 yuan is? In essence, the customer's expenditure is 27 yuan.
When talking about the customer's expenditure + younger brother's income = 29 yuan, this equation is unreasonable and meaningless.

So the real equation should be as follows,

Customer expenditure 27 = boss's income + younger brother's income = 25 + 2

Later, the customer earned 3 yuan, so 27 + 3 = 30.

 

So no money suddenly evaporated