There are 12 more boys in class 6 than 25 in the whole class, and the ratio of boys to girls is 2:1?

There are 12 more boys in class 6 than 25 in the whole class, and the ratio of boys to girls is 2:1?

A: there are 30 boys and 15 girls in class 6
The sum of the three numbers of a, B and C is 120. The number of a is twice that of B, and the number of C is three times that of B. what are the three numbers of a, B and C?
Let B be x, then a be 2x, C be 3x, then
X+2X+3X＝120
6X＝120
X＝20
2X＝40,
3X＝60
So the number a is 40, the number B is 20, and the number C is 60
B 120 (1 + 2 + 3) = 20
A 20 × 2 = 40
C 20 × 3 = 60
Let B be x, then a be 2x and C be 3x
X+2X+3X=120
X=20
A is 40, B is 20, C is 60
B: 120 × (1 / 6) = 20
A: 20 × 2 = 40
C: 20 × 3 = 60
2*3=6
120/6=20
20 * 2 = 40 ·· a
20 * 3 = 60 ··· C
40 / 2 = 20
The number of boys in class 3 (1) is 80% of the number of girls. There are 6 boys less than girls. How many boys and girls are there
Uncle Zhang's family collected 2400 kg of wheat the year before last, and 3000 kg of wheat last year. How much more than the year before last? The turnover of a hotel in August was 40000 yuan, and the business tax should be paid according to 5% of the turnover?
Girls are:
6÷（1-80%）
=6÷0.2
=30 people
Boys are:
30 × 80% = 24 persons
If you have any questions, please ask,
The sum of the three numbers of a, B and C is 120. The number of a is twice that of B. the number of C is 20 more than that of B. the numbers of a, B and C are () () ()
Let B be X
2x+x+x+20=120
x=25
A is 50
B is 25
C is 45
The numbers of a, B and C are (50) (25) (45) respectively
50、25、45
50,25,45
Let B be X
2X+X+X+20=120
4X=100
X=25
A 50
B 25
Classmate C 45: if you can't figure out the math problem, please go to math know it all, and the professional teacher will answer the question
Let B be x, then a be 2x and C be 20 + X
x+2x+20+x=120
x=25
The numbers of a, B and C are (50) (25) (45) respectively
B (120-20) △ 4 = 25
C 25 + 20 = 45
A 25 × 2 = 50
The number of boys in class 6 (3) accounts for 60% of the class. If the number of boys decreases by 5 and the number of girls increases by 3, the number of boys and girls will be equal. Q: how many students are there in class 6 (3)
Not equations, but formulas
（5+3）/（60%-40%）=40
The sum of the three numbers a, B and C is 120. A is twice as much as B, and C is 20 more than A. how many are the three numbers
Let B be x, then a be 2x and C be 2x + 20
X+2X+2X+20=120
5X=100
X=20
A = 2 * 20 = 40
B = 20
C = 40 + 20 = 60
x+y+Z=120 x=2y z=x+20
x+0.5x+x+20=120
x=40
y=20
z=60
Hypothesis: A: a
B: B
C: C
According to the question, a + B + C = 120; a = 2B; C-20 = a;
Then a + A / 2 + A + 20 = 120
The solution is a = 40; b = 20; C = 60
There are 126 students in three classes of grade seven in a school. The number of students in class one is 10% higher than that in class two, and the number of students in class three is 2 less than that in class one. How many students are there in each of the three classes of grade seven? If the number of students in class one, class two and class three is respectively x, y and Z, then we can get the equation system (binary once) according to the meaning of the question
x+y+z=126. x=10%X+Y. x-2=z
The sum of the three numbers is 120, the number a is twice that of the number B, the number C is 20 more than the number B, and the number C is 120___ .
Let B number be x, then a number be 2x, C number be x + 20.2x + X + X + 20 = 120 & nbsp; & nbsp; & nbsp; 4x + 20 = 120 & nbsp; 4x + 20-20 = 120-20 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x = 100 & nbsp; & nbsp; & nbsp; & nbsp; 4x △ 4 = 100 △ 4 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 25.25 + 20 = 45
There are 126 students in the fifth grade of Yufeng primary school
The sixth grade is 126 × 2 / 6 more than the fifth grade = 28
I hope I can help you. I wish you progress in your study. If you don't understand, please ask me. If you understand, please adopt it in time! (*^__ ^ *
There are three numbers a, B and C. A is 1 / 3 of the sum of two numbers B and C, B is 1 / 2 of the sum of two numbers a and C, and C is the sum of three numbers a, B and C?
Two point four