There are 3,500 students, of which 4 are boys and 5 are girls, how many are boys and girls?

The number of girls is x and the number of boys is 4 5x.

x+4/5x=3500

9/5x=3500

x = the number of people can only be an integer, indicating that the data in this question is wrong, but the calculation method can be learned and continued.

Number of boys: Human.

A: There are about 1,944 girls and 1,556 boys.

There are 3,500 students.

Let's say there are x number of girls.

Then there are 4 5x boys.

So x+4 5x=3500

No, I can't. In this case, you won't get a whole number.

There's something wrong with that.

Boys: 3500*4 9 1556.

Girls: 3500*5 9 1444 people.

Except for the exhaustion, the result is not an integer, and the question is not correct.

Simple oral arithmetic can do the math! Male 2800There are 700 girls, and only one person answered correctly before, and the others are rice buckets! I think people who answer incorrectly should not eat for a day!

Solution: If the number of girls is x, then the number of boys is 4 5x.

x+4/5x=3500

9/5x=3500

x=1944

Boys: 3500 1944=1556 (person).

A: There are 1,944 girls and 1,556 boys.

Suppose the boy or girl is a person, then the boy in the Shenqi section is 4 5a person, so.

a+4/5a=450

a=250 people, then boys are 250*4 5=200 people.

A: There are 200 male students and 250 female students. Hope.

If there are x girls, then x+4x+50=550, so there are 100 girls and 450 boys.

I didn't learn the solution of a quadratic equation in elementary school

Number of boys: 100 4 + 50 = 450

Number of girls: 550-450=100

Upper Primary School Solution:

The number of girls is x, and the number of boys is 4x+50

x+4x+50=550

Solution x=100

The number of girls is 100 and the number of boys is 100 4 + 50 = 450.

If there is a girl y, then y+4y+50=550, y=100

A: There are 100 girls and 400 boys.

In this question, the number of girls is regarded as unit one, which is calculated according to the column of the question.

The number of female students is:

100 (person).

The number of male students is:

100x4+50=450 (person).

Girls: (550-50) (4+1) = 100 people.

Boys: 550 100 = 450 people.

A: There are 450 boys and 100 girls.

There are 450 boys and 100 girls.

Question: There are 54 students in the sixth grade class, of which the number of boys is four-fifths of that of girls.

Solution: Suppose there are x girls and 4x out of 5 boys, and 4x + x = 54 out of 5

9 x 5 = 54

x = 54 9/5

x = 54 5/9

x = 30 number of boys = 4 out of 5 x = 4 out of 5 30 = 24 Answer: 24 boys and 30 girls.

Why do you encounter another problem, it won't be the same person's problem, in view of the previous question, list one yuan at a time and set the boy as x people, and the girl as x-40 people.

3/5x=(x-40)2/3

Calculate x=400

400 for boys and 360 for girls

It's so hard. I won't (I'll tell you a little secret, I'm actually here to find the answer to this question...)

1。Male 400 Female 150

Let the male be x and the female be y

x/4 -50=y/3

3x/4=2y

There are x parts in total.

x 15 -10 = 3x 5 15 + 2x 5 18 set the speed to x and the distance to y

y -1 can be calculated as y=6x, that is, the original 6 hours can be 120 x + y-120) = 6 - 2 3

Let's say the number of girls is x

Then the number of boys is (1 3 x + 50) * 4 = 2 x * 4 3

If x=150, then the number of boys is 400

Make men x people, women y people.

1/4x-1/3y=50

3/4x=2y

Solution: x=400

y=150 400 for males and 150 for females

Solution: From the meaning of the question, there are x boys and y girls.

1/4x-1/3y=50

3/4x=2y

system of equations) to find x equal to 400 and y equal to 150

Male 2 5 = female 2 3, that is, male 1 5 = female 1 3, and male 1 5 is 30 more than female 1 6 can be equivalent to female 1 3 3 more than female 1 6 30, so female 1 3 minus female 1 6 = 30, the number of females is 180 and the number of men is 300.

Suppose the number of boys is x and the number of girls is y

Then, 1 5x-1 6y=30;2 5x=2 3y solution gives x=300, y=180

So there are 300 boys and 180 girls.

300 for boys and 180 for girls Use a binary one-dimensional equation to solve, let the boy x person, the girl y person, from the meaning of the question: one-fifth x minus one-sixth y is equal to 30 two-fifths x minus two-thirds y is equal to zero Then the solution is x is 300, and y is 180