Answer:
16 Girls
Explanation:
Let x be the number of boys.
Let y be the number of girls.
So we know that:
y = 2x
y + x = 24
We can get the answer through substitution. Since we know that y = 2x, we can insert that into our second equation by replacing the y with the equation we came up with for y in the first equation.
![y + x = 24](https://img.qammunity.org/2019/formulas/mathematics/middle-school/z5h9bpw4v9s00nk6hqxcnv6tfc461iy8so.png)
![2x + x =24](https://img.qammunity.org/2019/formulas/mathematics/middle-school/zri44bt4e317w1is7tr6zf7vkx12c7gcvq.png)
![3x =24](https://img.qammunity.org/2019/formulas/mathematics/middle-school/aiwqkg9krpcuyv4x3eb25yjc0yq4y8aidm.png)
![x =(24)/(3)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/rr6nsfwntc9dsn2lshh35ero1unlr4m789.png)
![x =8](https://img.qammunity.org/2019/formulas/mathematics/middle-school/6fp7y2k6tsg73w4kfiytimqvz3ajgolvlq.png)
With that, we insert that answer into our first equation:
y =2x
y = 2(8)
y = 16
So there are 16 girls.