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In fact, the boss charged 25 yuan for accommodation, so your later 10-1 and 3x9 are not valid. 25 yuan divided by 3 to pay for each person, you can't use 9 yuan to calculate. You can calculate it like this, 30 yuan minus the 3 yuan that the boss returned to 3 people, that is 27 yuan, and then subtract the 2 yuan that the waiter hid then there is 25 yuan left, so this yuan is on these 3 people.

I don't know, can you understand what I'm saying?

9 yuan per person for 3 people, 3 * 9 = 27 (25 yuan room fee + 2 yuan waiter).

9 yuan per person for 3 people, 3 x 9 = 27 yuan + 2 yuan hidden by the waiter = 29 yuan, here the 2 yuan hidden by the waiter is double-counted, and the 3 yuan returned at the same time is not calculated, so it is displayed as 29 yuan.

It should be 3 * 9 = 27 + 3 yuan = 30 yuan, not missing a point.

Before, the boss took 30, the waiter took 0, the three people paid 10+10+10, then the boss took 25, the waiter took 2, and the three people paid 9+9+9, and the question was to take the 27 yuan they paid for accommodation (2 yuan is included in 27 yuan), and the 2 yuan taken by the waiter plus it was meaningless.

If you want to calculate the total amount of money, it should be 27 yuan, plus the boss to return 3 yuan to the waiter, and then to the passenger.

90*3-20=250, but not 90*3+20=290, the second formula is meaningless, because 20 has been included in 90*3, if you have to get 300, you can get 90*3+30=300This question is just to help you around the bend. A little bit of independent thinking ideas, just go around on their own.

Don't be led away by the question.

There is a difference in the logic of understanding, so it is not right.

If you understand $25, add $2 for a total. It's 27 yuan per person. So it's easy to understand Sa. Each person was given a dollar.

It's an old topic, and the concept is changed.

27+2 doesn't make sense at all.

It should be that 3 people spent a total of 27 = 25 (to the boss) + 2 (waiter) to have practical significance.

The three of them paid 27 yuan for accommodation, the boss charged 25 yuan, and the waiter hid 2 yuan, which was just right. You can't use the 2 yuan of the waiter to 27 yuan.

Summing up, this is a logical error.

One equals five, two equals 25, three equals 75, four equals one hundred and twenty-five, and five equals several great gods ask for answers.

Very intelligent people, they have a sequential calculation between them.

I'm only going to give you one question, if you can answer it, your IQ is at least 170 (Einstein's IQ).

There are two points A and B on the paper, and how to get closest from A to B.

Just list a few arithmetic problems that don't have a pattern.

Go to the IQ test** and do it, some of them are very useless, and 6 million people in the mainland have taken the test.

Male professor = x1, female professor = y1, male assistant professor x2, female teaching assistant y21 x1+y1+x2+y2=16

2 x1+y1x2>y2

4 y1>=1

From 1 and 2, we know that x2+y2>=9 , x1+y1<=7 and x2>=5 because x2>y2, and x1<=6 because y1>=1

From x2>=5,x1<=6,x1>x2 we know that x1=6,x2=5 from 2+y2>=9,x2=5

The result is x1=6, y1=1; x2=5, y2=4 and then there's the case where I'm missing.

1. x1+y1+x2+y2=15

2 x1+y1x2>y2

4 y1>=1

The result is x1=6, y1=1; x2=5, y2=3 so I'm y2, which is a female teaching assistant.

I don't know if that's right.

There are 6 male professors and 1 female professor.

There are 5 male teaching assistants and 4 female teaching assistants.

1+5=12=（1x2）+(5x2)=2+10=122+10=24=（2x2）+(10x2)=4+20=243+15=36=（3x2）+(15x2)=6+30=365+25=?=(5x2)+(25x2)=10+50=60 The fastest algorithm is that the first number is 12, the second is 24, the third is 36, and so on, and the fifth number is 60

And 4 + 20 = 48, multiply by 2 times.