Yes the ratios are equivalent and the value is 3 : 1
<h3>What are ratios?</h3>
This is a term used to refer to relations between two values which shows the number of times one of the value is contained in the other value.
<u>Given data</u>
18 balloons for every 6 centerpieces _____ratio 1
27 balloons for every 9 centerpieces _____ratio 2
<h3>ratio 1</h3>
18 for 6 is
18 : 6 this is simplified further to 3 : 1
<h3>ratio 2</h3>
27 for 9 is
27 : 9 this is simplified further to 3 : 1
since both simplifies to same values 3 : 1 they are said to be equivalent
Read more on ratios here: brainly.com/question/2328454
#SPJ1