The ratio of boys to girls is 3 to 1. In a school of 400 students, how many are girls? The answer must be a whole number
The ratio of boys to girls is 3 to 1, which means that for every 3 boys, there is 1 girl.
To find the number of girls in a school of 400 students, we can start by determining the ratio of boys to the total number of students. This ratio would be 3 boys to 4 students (3 boys + 1 girl = 4 students).
To find the number of girls, we can set up a proportion:
(1 girl) / (4 students) = (x girls) / (400 students)
Cross-multiplying, we get:
1 * 400 = 4 * x
400 = 4x
Dividing both sides by 4, we find:
x = 400 / 4
x = 100
Therefore, there are 100 girls in the school.
To solve this question, we need to determine the number of girls in the school. The ratio of boys to girls is given as 3 to 1, which means that for every 3 boys, there is 1 girl.
First, we need to determine the total number of parts in the ratio, which is 3 + 1 = 4 parts.
Next, we can find the value of one part by dividing the total number of students (400) by the total number of parts (4):
400 students / 4 parts = 100 students per part.
Now, we know that one part represents 100 students. Since the ratio states that there is 1 girl for every 3 boys, we can conclude that there are 100 girls for every 300 boys.
To find the number of girls, we multiply the number of parts representing girls (1) by the value of one part (100 students):
1 * 100 students = 100 girls.
Therefore, there are 100 girls in a school of 400 students
To find out how many girls there are in the school, we need to find the fraction of girls out of the total number of students.
The ratio of boys to girls is 3 to 1. This means that for every 3 boys, there is 1 girl.
Since the total ratio is 3 + 1 = 4 (3 boys + 1 girl), we can calculate the fraction of girls by dividing 1 (the number of girls) by 4 (the total ratio):
1 / 4 = 0.25 or 25% (as a decimal) or 25/100 (as a fraction)
Now, to find the number of girls, we multiply this fraction by the total number of students in the school:
0.25 * 400 = 100
So, there are 100 girls in the school.