One: Assuming that they are all 6 yuan, if they are not established, they will decrease in turn until they are established; Assuming that there is no 2 yuan, if it is not established, it will be added one by one until it is established.
Two: respectively
A, B and C
Represents the average score of the original first prize, second prize and third prize, and the subscript number indicates the number of students, a.
Said before ranking, b said after ranking, such as B[a5] said the average score of the top five of the original second prize, if there is no subscript, it is
The average score of all students in the original first prize. Because the adjusted number of newly transferred first and second prizes accounts for the total number of prizes.
Half, the average is the average of the number of people left behind and the number of people newly transferred, so it can be listed as follows:
( 1)
A-(A+B[a5])/2=(A-B[a5])/2=3
(The average score of the first prize dropped by 3 points)
(2)
5B[a5]+ 10B[b 10]= 15B
(Total score of original second prize)
(3)
B-(C[a 10]+B[B 10])/2 = 2
(The average score of the second prize dropped by 2 points)
(4)
10C[a 10]+30[b30]= 40C
(Total score of the original third prize)
(5)
C-C[b30]=2
(The average score of the third prize dropped by 2 points)
(6)
B-C=7
(The average score of the second prize is 7 points higher than that of the third prize)
After adjustment, the average score of the first prize is higher than that of the second prize (A+B [A5])/2-(C [A10]+B [B10])/2.
The expression of the former part can be obtained by (1)* 10+(2)*2, and the expression of the latter part can be obtained by (3). After the combination,
The surface formula can calculate the result, but it is not unique. There is an unrealistic part in the middle, which should be the score difference or the score reduction.
Something is wrong.
Third, let the original speed of armor
A and b are
B, the distance is
That is all right
k=2(a+b)
2k=3.6(a+ 1+b+ 1)
keep
a+b
Enter the second form, get
k=36