In a class of the students in a class are girls. There are 28 boys.
What fraction of the class are boys?
How many students are in the class?

Step-by-step explanation:

Given

---  missing information

Solving (a): The fraction that are boys

We have:

This implies that

Solving (b): Students in the class

If 1/4 are boys, then:

We also have that:

So:

its the fourth option

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads