Question

mr. robinson has 20 students on his martial arts class. the ratio of boys to girls is 4:1. how many boys and giris are in mr. Robinson's class?

Answer 1

16 boys and 4 girls
Since there is 20 students...and the ratio is 4:1
To get to 16:4 you multiply 4 to get 16 and multiply 1 by 4 to get 4.
Now that it is 16:4 there is a total of 20 students..

Answer 2

Since the ratio of boys to girls is 4:1, we can represent the number of boys as 4x and the number of girls as 1x.
We know that the number of boys + girls = 20. (total number of students)
4x + 1x = 20
5x = 20
Divide by 5...
x = 4
Now that we know x = 4...
Number of boys = 4x = 4(4) = 16
Number of girls = 1x = 1(4) = 4