Answer:
1:3
Step-by-step explanation:
We are given that
Total number of students in Mr Kole's class=30
Number of girls=Twice the number of boys.
We have to find the ratio of boys to total students.
Let number of boys in the class=x
Total number of girls in the class=2x
Total students in the class=30
![x+2x=30](https://tex.z-dn.net/?f=x%2B2x%3D30)
![3x=30](https://tex.z-dn.net/?f=3x%3D30)
![x=\frac{30}{3}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B30%7D%7B3%7D)
By using division property of equality
![x=10](https://tex.z-dn.net/?f=x%3D10)
Number of boys in the class=10
Ratio of boys to total students=![\frac{10}{30}=\frac{1}{3}](https://tex.z-dn.net/?f=%5Cfrac%7B10%7D%7B30%7D%3D%5Cfrac%7B1%7D%7B3%7D)
Ratio of boys to total students=1:3