Question

There are 21 students in a class. The ratio of the number of boys to the number of girls is 4:3. How many girls are in the class?

Answer 1

Explanation:

4:3 total is 7

8:6 total is 14

12:9 total is 21

So there are 9 girls.

Answer 2

Answer: 9

Explanation:

Given : There are 21 students in a class.

It is given that the ratio of the number of boys to the number of girls is 4:3.

Let 4x be the number of boys and 3x be the number of girls in class.

According to the question , we have

`3x+4x=21\\\\\Rightarrow\ 7x=21\\\\\Rightarrow\ x=(21)/(7)=3`

Now, the number of girls in class = 3x= 3(3)=9

Hence, there are 9 girls in class.