The ticket price of group buying park tickets is as follows: the number of people buying tickets is 1-5051-100100, and the ticket price per person is 13119. There are two tour groups A and B. It is known that the number of people in group A is less than 50, and the number of people in group B is not more than 100. If they buy tickets separately, the total ticket fee payable is 1392 yuan. If they buy tickets together as a group, the total ticket fee payable is 1080 yuan (2) how many people are there in each group?

The ticket price of group buying park tickets is as follows: the number of people buying tickets is 1-5051-100100, and the ticket price per person is 13119. There are two tour groups A and B. It is known that the number of people in group A is less than 50, and the number of people in group B is not more than 100. If they buy tickets separately, the total ticket fee payable is 1392 yuan. If they buy tickets together as a group, the total ticket fee payable is 1080 yuan (2) how many people are there in each group?

(1) Suppose that the number of group B is less than 50, then the number of group A and group B is less than 100. ∵ 1392 ∵ 13 = 1071131080 ∵ 11 = 98211, that is, 1392 is not a multiple of 13, 1080 is not a multiple of 11, ∵ the number of group B is not less than 50, not more than 100; (2) suppose that the number of group A and group B is x, y

The ticket price of a park is shown in the table below: the number of people who buy tickets is 1-50 people & nbsp; 51-100 people & nbsp; the ticket price for each person with more than 100 people & nbsp; is 13 yuan & nbsp; 11 yuan & nbsp; The first and second classes of Siyi middle school plan to visit the park, of which (1) the class is small, less than 50 people; (2) the class is large, more than 50 people. If the two classes buy tickets separately, they should pay a total of 1207 yuan. If the two classes unite to buy tickets as a group, they only need to pay 909 yuan. (1) judge whether there is such a possibility : when the number of people is between 51 and 100, the amount of money is equal to that when the number of people is more than 100? If so, how many people are there? (2) How to judge whether the total number of two classes is more than 100 or less than 100? (3) (4) if the two classes don't buy tickets together, do the students in class 1 of junior high school have to buy tickets with a unit price of 13 yuan? What can you do to save money? Give me your reasons

(1) Suppose there are X students in class 1 and y students in class 2 of grade 1. Suppose there is an equal number of tickets. It is a positive integer solution that satisfies the meaning of the question: 11x = 9y, ∵ x < 100, Y > 100. Answer: 90 students and 110 students, 99 students and 121 students respectively. (2) we can use 11 or 9 to remove 909, which is the correct total number. 909 △ 9 = 101, answer: obviously more than 100 students (3) According to the meaning of the question, we get x + y = 10113x + 11y = 1207, and the solution is x = 48y = 53. Answer: there are 48 people in class 1 and 53 people in class 2. (4) they can buy tickets for 51 people, saving 48 × 13-51 × 11 = 63 yuan

A total of 104 students from classes 12 and 12 of Grade 7 went to a park for spring outing. There were less than 50 students in class 1 and more than 50 students in class 2
Number of tickets purchased: [1-50] [51-100] [more than 100]
Ticket price per ticket: [13 yuan] [11 yuan] [9 yuan]
(1) If both classes buy tickets for their units, they will pay a total of 1240 yuan. How many people are there in each class?
(2) If the two classes buy tickets together, how much is it?
(3) If the number of people in the two classes is equal, do you think it is cost-effective to buy tickets in different classes or in groups?

(1) There are less than 50 people in the first class, so the ticket price is 13 yuan. There are more than 50 people in the second class, so the ticket price is 11 yuan
Suppose the number of people in a class is x, 13X + 11 (104-x) = 1240, and the solution is x = 48
So there are 48 people in class one and 56 people in class two
(2) All together, the number of people who buy tickets is more than 100, and the ticket price is 9 yuan. The total cost is 9 * 104 = 932 yuan
It can save 1240-932 = 308 yuan
(3) If the number of people in the two classes is equal, there will be 52 people in each class,
If separated, the cost is 52 * 11 * 2 = 1140 yuan
If you buy them together, the cost is 104 * 9 = 932 yuan
So it's worth buying together

According to the survey, the bicycle storage in a park on a Sunday is 4000 vehicles
According to the survey, the storage capacity of a park bicycle store on a Sunday is 4000 vehicles, of which the storage fee for variable-speed vehicles is 0.30 yuan per vehicle, and that for ordinary vehicles is 0.20 yuan per vehicle. If the number of ordinary vehicles is x vehicles, and the total income of the storage fee is y yuan, then the function relationship between Y and X is as follows_______________ ．

y=1200-0.10x
Detailed process: because the number of ordinary cars stored is x, so the number of variable-speed cars stored is 4000-x, so the income of ordinary cars storage fee is 0.20x, and that of variable-speed cars storage fee is 0.30 (4000-x), so the total income of storage fee is y = 0.20x + 0.30 (4000-x) yuan, and the solution is y = 1200-0.10x yuan

Problems of data and analysis
There are seven numbers from small to large, with an average of 38. If the average of the first four numbers is 33 and the average of the last four numbers is 42, find the median of the seven digits
Why is the median = first 4 numbers + last 4 numbers - 7 numbers = 33 * 4 + 42 * 4 - 38 * 7 = 34

Because the first 4 numbers + the last 4 numbers = the first 3 numbers + the last 3 numbers + the median of 2 times = 7 numbers + the median
So the median = the first 4 numbers + the last 4 numbers - 7 numbers
Example: (a + B + C + D) + (D + e + F + G) = a + B + C + D + e + F + G + D
So d = (a + B + C + D) + (D + e + F + G) - (a + B + C + D + e + F + G)

Average, weighted average, arithmetic average, please help me talk about the relationship between, I am dizzy,

There are two types of averages:
Arithmetic mean, weighted mean
The average we usually say is the arithmetic average. For example, to calculate the average score of a math exam in your class is actually the arithmetic average
The formula has to be used to calculate the weighted average
No matter what kind of average, our calculation idea is "sum divided by total number"

There are 14 data, ranging from small to large, with an average of 34. Now a student has calculated that the average of the first eight numbers of this group of data is 32, and the average of the last eight numbers is 36, so the median of this group of data can be calculated!

(32*8+36*8-34*14)/2=34
The sum of the first eight numbers and the last eight numbers: 32 * 8 + 36 * 8, is the sum of these 14 numbers: 34 * 14 plus the middle two numbers, so subtract and divide by 2 to get the median

A school plans to send a high jumper to participate in an intercollegiate competition. Two high jumpers A and B have been selected for eight times. Their competition (unit: m) is as follows“
A: 1.70 1.65 1.68 1.69 1.72 1.73 1.68 1.67
B: 1.60 1.73 1.72 1.61 1.62 1.71 1.70 1.75
It is predicted that 65m is likely to win the championship. In order to win the championship of high jump, which athlete may be chosen to participate? If it is predicted that 1.70m can win the championship?
(write the process)

A: average: (1.70 + 1.65 + 1.68 + 1.69 + 1.72 + 1.73 + 1.68 + 1.67) / 8 = 1.69 (m) B: average: (1.60 + 1.73 + 1.72 + 1.61 + 1.62 + 1.71 + 1.70 + 1.75) / 8 = 1.68 (m) (1) high jump 1.65m is likely to win the championship, a: variance: ((1.70-1.65) * (1.70-1.65) + (1

Party A and Party B sweep a land of 1200 square meters. There are 30 people in team a and 20 people in team B. they are divided into two teams according to the number of people. How many square meters are swept by each team?

30:20 = 3:2 1200 * 3 / (2 + 3) = 720 square meters 1200-720 = 480 square meters

A cleaner is cleaning the street
A cleaning worker was cleaning the street. A young man threw the peels on the road. The cleaning worker quickly came forward to dissuade him
Cleaner: little brother, please don't throw the peel on the ground. The ground has just been swept
Young man: if I don't throw it, if he doesn't, won't you be laid off? I'm thinking about you!
Cleaner: Yes
The young man was speechless for a moment. He stooped to pick up the peel and said: ----------------------------------------------------------------------

Cleaner: I may lose my job, but you lose your personality
Young man: I'm sorry, I'm sorry, I'm wrong
Cleaner: it's OK