The ratio of girls to boys is 3 to 1. If there is a total of 400 students, how many are boys?
To find out how many boys there are, we need to determine the ratio of boys to girls.
Given that the ratio of girls to boys is 3 to 1, we can determine the total number of parts in the ratio by adding the two parts together: 3 + 1 = 4.
Next, we can divide the total number of students (400) by the total number of parts in the ratio: 400 ÷ 4 = 100.
Since there is 1 part representing boys in the ratio, we can multiply the result of the division by 1 to find the number of boys: 100 × 1 = 100.
Therefore, there are 100 boys among the 400 students.
The ratio of girls to boys is 3 to 1, which means if there are 3 girls for every 1 boy, there are 3 + 1 = <<3+1=4>>4 parts total.
There are 4 parts total in the class and since each part represents 400/4 = <<400/4=100>>100 students, then each part represents 100 boys.
If there are 4 parts in the class, then there are 100 boys/part * 4 parts = <<100*4=400>>400 boys. Answer: \boxed{400}.
To determine the number of boys, we need to calculate the proportion of boys in the total number of students.
Step 1: Add the parts in the ratio (3 + 1) to find the total number of parts in the ratio.
3 + 1 = 4
Step 2: Divide the total number of students by the total number of parts in the ratio.
400 students / 4 parts = 100 students per part
Step 3: Multiply the number of students per part by the number of parts that represent boys (1 part).
100 students per part * 1 part = 100 boys
Therefore, there are 100 boys among the 400 students.