In a village of people infected with Hiv in 2001 were 100.in 2004, 250 people were infected. Find the ratio of those infected in 2001 to those infected in 2004.

Successes also include the development and effective use of highly sensitive and specific HIV screening tests, which have virtually eliminated infection from the blood supply in the developed world and in most parts of the developing world

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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