# Math

posted by .

55% of the studnts in a school are girls.find the total no. of studnt in the school if the no. of boys is 18 .

• Math -

S = Numbers of students

Percent of boys.

100 % - 55 % = 45 % = 45 / 100

45 % S = 18

45 S / 100 = 18 Multiply both sides by 100

45 S = 18 * 100

45 S = 1800 Divide both sides by 45

S = 1800 / 45 = 40

## Similar Questions

1. ### Math

For every girl taking classes at the martial arts school, there are 3 boys who are taking classes at the school. If there are 236 students taking classes, write and solve a porportion to predict the number of boys taking the classes …
2. ### English

1. I'm in the third year of middle school. 2. I'm in the third year in middle school. (Which preposition do we have to use?
3. ### math

3/4 of the students in a school were girls and the rest were boys. 2/3 of the girls and 1/2 of the boys attended the school carnival. Find the total number of students in the school if 330 students did not attend the carnival.
4. ### MATHS

Two different schools (A and B) have the same number of pupils. The ratio of the boys in school A and the boys in school B is 2:1 and the ratio of the girls in school A and the girls in school B is 4:5. Find the ratio of the boys in …
5. ### math

the current ratio of boys to girls at a certain school is 2 to 5 . if 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. how many boys currently attend the school?
6. ### Theories and issues in working with school-age chi

According to the National Center for Educational Statistics, which of the following is a false statement?
7. ### math

At a sports carnival,the ratio of number of pupils sent by school A,B and school C to the event was 1:2:3. The number of boys from school A and the number of girls from school B were the same. The ratio of the number of girls from …
8. ### Math

Parkview Middle School has 3 boys to every 4 girls. Cypress Elementary School has 3 boys to every 7 total students. Both schools have 567 students. Which of the following statements is true. a. Parkview has more boys than Cypress. …
9. ### math

There are 42 student in a class 3/4 of the boys and 2/3 of the girls travel to school by bus. The total number of boys and girls who come to school by bus is 30. How many boys are there in the class?
10. ### Math

60%student in a school are boys. Find the total number of student in a school if there are 240 girls in the school.

More Similar Questions