Answer: 18 girls to 12 boys
Step-by-step explanation: We can write a ratio using the word "to", using a colon, or using a fraction bar.
Let's write the ratio using the word "to."
Since there are 18 girls and 12 boys,
we can write this as 18 girls to 12 boys.
So this would be our answer.
However, this can be reduced to 3 girls to 4 boys.