There are 450 students in Yuhong Primary School, how many boys and girls are there?

1.Number of female students = (450) (2 3 + 1) = 450 (5 3) = 3 * 90 = 270;

Number of boys = 450-270 = 180;

2.Remaining = 24 * (1 - 1 4 - 3 8) = 24 * (3 8) = 9 km;

3.The topic is incomplete.

4.product = (2 3 + (1 5) (3 4))*1 4) = 7 30;

5.number = (36 (4 9))(1 3)+4=81*(1 3)+4=27+4=31;

6.Temperature = -18 + 22 = 4

1.If there are x girls and 2x 3 boys, then there are 2x 3 + x = 450, so x = 270, so there are 270 girls and 180 boys.

2.24*(1-1 4-3 8)=9 km.

3.The topic is incomplete. But the reason is very simple, along with the water - against the water = 2 times the water velocity.

5.Let this number be x, according to the title, 4x 9=36, so x=81, so 81 3=27, 27+4=31

6.-18+22=4, so the temperature of the refrigerator is 4 degrees Celsius.

1.Solution: If the number of girls is x, then the number of boys is 2 3x.

x+2/3x=450

5x=1350

x=2702/3x=180

A: There are 180 boys and 270 girls.

2.(The problem is not complete, oh, three-eighths of whom I repaired has not been made clear, I will solve it separately, and I want to see which one I want to see clearly).

Solution: (1) If the remaining three-eighths are repaired the next day.

24-24*1 4-24*3 4*3 8=24-6-27 4=2) If the next day you have repaired three-eighths of the total length.

24-24*1/4-24*3/8=9m

3.Solution: Let the speed of the ship be xm s and the water speed be ym s

x+y=18 and x-y=15

2x=33 x=

y=A: The speed of the boat is, and the speed of the water is.

4.[2 3 + (1 5 divided by 3 4)]*1 4=(2 3+4 15)*1 4=14 15*1 4=7 30

5.Let this number be x

4/9x=36 x=81 1/3x+4=31

There are 450 (1+2 3)=270 girls.

450-270 = 180 boys.

24 * (1-1 4-3 8) = 9 meters.

Question completion. 4 degrees.

1.Solution: If the number of girls is x, then the number of boys is 2 3x.

x+2/3x=450

5/3x=450

x=270270x2 3=180 (person).

2.Solution: Let there be x meters left.

6+12+x=24

18x=24

x = 4 3 (m).

4.（2/3+1/5÷3/4）x1/4

2/3+4/15）x1/4

14/15x1/4

5.This number: 36 4 9 = 81

Solution: Let the number more than one-third of this number be 4 is x.

x—81x1/3=4

x-27=4

x=4+27x=31

Solution: If the number of girls is x, then the number of boys is 2 3x.

x+2/3x=450

5/3x=450

x=270270x2 3=180 (person).

Kilometer. Solution: Let the speed of the ship be x kilometers per hour and the speed of the water be y kilometers per hour.

Column equations: x+y=18

x-y=15

Solution: x=y=(2 3+4 15)x1 4

14/15x1/4

5..Let this number be x, according to the title.

4x/9=36，x=81

1.Number of female students = (450) (2 3 + 1) = 450 (5 3) = 3 * 90 = 270;

Number of boys = 450-270 = 180;

2.Remaining = 24 * (1 - 1 4 - 3 8) = 24 * (3 8) = 9 km;

3.Water velocity = (18-15) 2=kmh;

Speed = (18+15) 2=km/h.

4.product = (2 3 + (1 5) (3 4))*1 4) = 7 30;

5.number = (36 (4 9))(1 3)+4=81*(1 3)+4=27+4=31;

6.Temperature = -18 + 22 = 4

1.There are 180 boys and 270 girls.

2.There are 9 kilometers left.

3.Solution: Let the speed of the ship be x kilometers per hour and the speed of the water be y kilometers per hour.

Column equations: x+y=18

x-y=15

Solution: x=y=Answer: The speed of the ship is kilometers and hours, and the speed of water is kilometers and hours.

6.4 degrees Celsius.

1.There are 450 students in Yuhong Primary School, how many boys and girls are there?

The number of boys is two-thirds of that of girls.

Then the male-to-female ratio is 2:3

Female: 3*90=270

Male: 2*90=180

2.A tunnel of 24 kilometers, a quarter of it was repaired on the first day, and three-eighths of it was repaired on the second day.

Did you fix the whole thing the next day or the rest?

It's not kind for children to rely on this method to complete their homework!

There are 350 boys and the ratio of boys to girls is 5:4, so the number of girls is 350 4 5 = 280, and the number of Red Star Primary School is 350 + 280 = 630.

There are 350 boys in Hongxing Primary School, and the ratio of boys to girls is 5:4, how many people are in Hongxing Primary School?

Think of it this way, and the proportion of male students in the total workforce is 5 (5+4) 5 9

So all 350 5 9 will do.

350 5 * (5 + 4) = 70 * 90 = 630 people.

350 5 * 4 = 280 + 350 = 630 people.

There are two methods, one is based on the proportion, the number of copies of the total number of people multiplied by the number of people per serving.

The other is to find the number of girls plus the number of boys.

702 (1+2) 234 people.

234 2,468 people.

A: There are 468 boys and 234 girls.

6+5=11

Because 11 80 = 880

So the number of students in an elementary school is 880

Boys: 880 6/11 = 480 (person).

Girls: 880 5/11 = 400 (person).

A: There are 480 boys and 400 girls in the primary school, because the number of people in the range of 800-900 can only be 880, so there are 480 boys and 400 girls.

I'm in the sixth grade of primary school, absolutely correct, this is a question on our test paper In addition, I really don't understand why everyone upstairs made it so complicated, how simple a question is, there are 11 !!

A: There are 480 boys and 400 girls.

Solution: Set 6x boys and 5x girls.

6x+5x=880

11x=880

x=806x=480

5x=400

Answer: There are 480 boys and 400 girls.

There are 4340-320 = 20 more boys than girls in Yuhong Primary School, so there are 20 more girls than boys in Chaoyang Primary School.

According to the title. The number of boys in Chaoyang Primary School is considered as unit 1

So Chaoyang Primary School has 20 20% = 100 boys.

There are 100 + 20 = 120 female students.

If the number of boys in Chaoyang School is x, then the number of girls in Chaoyang Primary School is the question: 340+x=320+

20 = solution x = 100

The number of girls is 120.

220 divided by (person.

100* people.

Explanation: Since the boy is a multiple of the girl, the girl is the unit 1, it is 1 times, 1+ is the total score of the male and female students, the total number is divided by the total number of copies, and the number is obtained by the number of copies, which is also the unit 1, and then the result can be obtained according to the relationship between men and women.

If the number of girls is x, then the number of boys is, and the total number of students in the class is x+

The solution is x=100, so there are 120 boys and 100 girls in the fifth grade of Red Star Elementary School.