Why is communication so important

That's a pretty abstract question; unfortunately, my answer may not fit your prompt/assignment cause there are a lot of ways to look at it.

Communication allows living things to exchange ideas that, in essence, help a group survive or better their living conditions.

This is the most fundamental definition; communication helps us, in essence, convey information.

I'm sorry if I wasn't of much help; consider resending the question with more context.

steps:

1. do 28-12= 16 girls

2. your ratio is 12: 16

3. your answer is b. 3/4

4. this correct because

12 divided by 4 is 3

16 divided by 4 is 4

5. your answer is 3/4