Answer :
Given:
The number of boys is 17.
The number of girls is 18.
The ratio of a to b is represented as a:b.
So, the ratio of girls to all children is,
[tex]\begin{gathered} \text{ All Childrens=17+18=35},\text{ Number of girls=18} \\ a\colon b=18\colon35 \end{gathered}[/tex]Answer: the ratio of girls to all children is 18:35