The ratio of male to female students was 6:5. Later, the number of female students increased by 5, and now the number of female students is 8 / 9 of that of male students?

The ratio of male to female students was 6:5. Later, the number of female students increased by 5, and now the number of female students is 8 / 9 of that of male students?

Assuming that the number of boys is 6x and the ratio of male to female is 6:5, the number of girls is 5x,
The number of female students is increased by 5, and the number of female students is now 8 / 9 of that of male students. We can get 5x + 5 = 8 / 9 * 6x, and x = 15
Number of female students 5x = 75
The average number of three numbers of a, B and C is 15, and a is equal to two to three. B is 3 / 5 of C. what is the number of B?
A 9 B 13.5 C 22.5
1. The ratio of male to female in a class is 4:3, and then two boys are transferred. At this time, the ratio of male to female is 6:5. How many girls are there?
2. There are 60 more male workers than 3 / 5 of the total workers, and 1 / 3 more female workers than male workers. How many workers are there in all? Please use the formula instead of the equation
1. 2 / (4 / 7-6 / 11) 5 / 11 = 35
2、60/(3/4-3/5)=400
There are three numbers a, B and C. A is 3 to 4, B to C is 5 to 7. Find the ratio of three numbers a, B and C
A: B = 3:4;
B: C = 5:7;
Then a: B: C = 3 × 5:4 × 5:7 × 4 = 15:20:28;
If you don't understand this question, you can ask,
There are several boys and girls in the classroom. The ratio of the number of boys to the number of girls is 4:3. Then there are 12 girls, which is twice the number of boys and girls
Boring answer to report the equation
Let the number of boys be x and the number of girls be y
If y = 4x: 4, then y = 4x: 4
And 2 (Y-12) = x 2
From the solution of (1) and (2), x = 48, y = 36
The average number of a, B and C is 65. A: B: C is equal to 4:5:6. What is the product of a, B and C?
In the 30th London Olympic Games, the Chinese team won 88 medals and the bronze medal ratio was 38:27:23. How many gold medals and bronze medals did the Chinese team win? Be sure to answer!
A = 65 × 4 / 5 = 52
B = 65
C = 65 × 6 / 5 = 78
52×65×78=263640
88÷（38+27+23）=1
Gold medal 38 × 1 = 38
Silver 27 × 1 = 27
Bronze medal 23 × 1 = 23
Let a = 4x, B = 5x, C = 6x
（4x+5x+6x）÷3=65
x=13
A 13 × 4 = 52
B 13 × 5 = 65
C 13 × 6 = 78
52×65×78=263640
A: the product of a, B and C is 263640
4+5+6=15
A: 65x3x4 / 15 = 52
B: 65x3x5 / 15 = 65
C: 65x3x6 / 15 = 78
52x65x78=263640
38, 27, 23
First, let a be 4x, then B be 5x, and C be 6x (according to the proportion)
(4x + 5x + 6x) / 3 = 65 (based on the average of 65), x = 13 is obtained
Therefore: A is 52, B is 65, C is 78
Second, according to the meaning of the title, there are 38 + 27 + 23 = 88 medals, of which 38 are gold medals, 27 are silver medals and 2 are bronze medals
First, let a be 4x, then B be 5x, and C be 6x (according to the proportion)
(4x + 5x + 6x) / 3 = 65 (based on the average of 65), x = 13 is obtained
Therefore: A is 52, B is 65, C is 78
Second, according to the meaning of the title, there are 38 + 27 + 23 = 88 medals, including 38 gold medals, 27 silver medals and 23 bronze medals. Therefore, gold medals, silver medals and bronze medals account for 38 / 88, 27 / 88 and 23 / 88 of the total respectively (converting the proportion into scores), so there are 88 * (38 / 88) = 38 gold medals, 88 * (27 / 88) = 27 silver medals and 88 * (23 / 88) = 23 bronze medals. (recommend to see the textbook of grade five in primary school, it says) ask: Thank you, too!
The ratio of boys to girls is 4:3, and then 12 girls are left. At this time, the ratio of boys to girls is 2:1. How many boys and girls are there
Suppose there were 4x boys and 3x girls
4X：3X-12=2：1
6X-24=4X
2X=24
X=12
Boys = 12 * 4 = 48
Girls = 12 * 3 = 36
Do not understand can ask, help please adopt, thank you!
12 (3 / 4 - 1 / 2) = 48 boys
48 × 3 / 4 = 36 girls
There are 4x boys and 3x girls
So 4x: (3x-12) = 2:1
x=12
There are 48 boys and 36 girls
If the original number of boys is 4x, the original number of girls is 3x
There are 4x: (3x-12) = 2:1
4x=2(3x-12)=6x-24
2x=24
x=12
4X = 48 for boys and 3x = 36 for girls
The average number of a, B and C is 65, a: B; C is equal to 4:5:6, what is the product of a, B and C
65×3=195
There are 20 boys in a class, and the ratio of boys to girls is 10:11. How many girls are there in this class
There are two more girls than boys in a class. The ratio of boys to girls is 10:11. How many boys and girls are there in this class
The perimeter of the rectangle is 80cm, and the ratio of length to width is 5:3. What is the area of the rectangle
The sum of the edges of a rectangle is 48 cm, and the ratio of length to width to height is 3:2:1. What is the volume of the rectangle
I don't know if you've ever studied functions
Method 1
1. According to the ratio of male to female, the proportion of male students in the whole class is 10:22
2.10/22 is the proportion of boys in the whole class. We know that there are 20 boys in the class, so we can get that there are 44 boys in the class
3. Female = 44-20 = 22
Method 2
Suppose that there are x girls, then 20: x = 10: 11, and the direct result is x = 22
The following supplementary questions are of the same type and can be calculated in the same way, hoping to help you
The average number of a, B and C is 19. The average number of a and B is 17. What's the number of C
C = 19 × 3-17 × 2 = 23
23. Why