What is the greatest common factor of 20 and 36? 2 4 5 6

For this case we have that, by definition, the greatest common factor or GCF of two numbers is the largest number that is a factor of both numbers.

so:

20: 10,5,4,2,1

36: 18,12,9,6,4,3,2,1

So, the greatest common factor of 20 and 36 is 4

GFC: 4

Option B

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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